US12077585B2 - Proteins comprising kallikrein related peptidase 2 antigen binding domains and their uses - Google Patents

Proteins comprising kallikrein related peptidase 2 antigen binding domains and their uses Download PDF

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US12077585B2
US12077585B2 US16/937,285 US202016937285A US12077585B2 US 12077585 B2 US12077585 B2 US 12077585B2 US 202016937285 A US202016937285 A US 202016937285A US 12077585 B2 US12077585 B2 US 12077585B2
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constant region
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antibody
chain constant
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US20210040210A1 (en
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Rajkumar Ganesan
John Lee
Jinquan Luo
Theresa McDevitt
Fei Shen
Degang Song
Raymond Brittingham
Sathyadevi Venkataramani
Sanjaya Singh
Yonghong Zhao
Fang Yi
Sherry Lynn La Porte
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Janssen Research and Development LLC
Janssen Biotech Inc
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Definitions

  • the invention provides antigen binding domains that bind kallikrein related peptidase 2 (hK2) protein comprising the antigen binding domains that bind hK2, polynucleotides encoding them, vectors, host cells, methods of making and using them.
  • hK2 kallikrein related peptidase 2
  • Prostate cancer is the second most frequently diagnosed cancer and the sixth leading cause of cancer death in males, accounting for 14% (903,500) of the total new cancer cases and 6% (258,400) of the total cancer deaths in males worldwide.
  • the course of prostate cancer from diagnosis to death is best categorized as a series of clinical stages based on the extent of disease, hormonal status, and absence or presence of detectable metastases: localized disease, rising levels of prostate-specific antigen (PSA) after radiation therapy or surgery with no detectable metastases, and clinical metastases in the non-castrate or castrate stage.
  • PSA prostate-specific antigen
  • ADT Androgen depletion therapy
  • Kallikrein related peptidase 2 (hK2, HK2) is a trypsin-like enzyme with androgen receptor (AR)-driven expression specific to prostate tissue and prostate cancer.
  • hK2 is activated by Transmembrane Protease, Serine 2 (TMPRSS2) and secreted into the ducts of the prostate, where it initiates a cascade that cleaves semenogelin, the extracellular matrix in ejaculate, to enhance sperm motility.
  • TMPRSS2 Transmembrane Protease, Serine 2
  • hK2 expression is restricted to the prostate and prostate cancer tissue, however it has recently been demonstrated that hK2 was detectable in breast cancer lines and primary patient samples after appropriate activation of the AR-pathway by steroid hormones (U.S. Pat. Publ. No. 2018/0326102). Similar to PSA, retrograde release of catalytically inactive hK2 into the blood occurs when the highly structured organization of the prostate is compromised upon hypertrophy or
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises: a heavy chain complementarity determining region (HCDR) 1, a HCDR2 and a HCDR3 of a heavy chain variable region (VH) of SEQ ID NO: 137 and a light chain complementarity determining region (LCDR) 1, a LCDR2 and a LCDR3 of a light chain variable region (VL) of SEQ ID NO: 138; or the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 137 and the LCDR1, the LCDR2 and the LCDR3 of the VL of SEQ ID NO: 138; or the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 162 and the LCDR1, the LCDR2 and the LCDR3 of the VL of SEQ ID NO:
  • the disclosure also provides an isolated antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises a heavy chain variable region (VH) of SEQ ID NO: 75 and a light chain variable region (VL) of SEQ ID NO: 74.
  • hK2 kallikrein related peptidase 2
  • the disclosure also provides isolated antigen binding domains that bind hK2 comprising certain VH and VL amino acid sequences.
  • the disclosure also provides an isolated multispecific protein comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises a heavy chain complementarity determining region (HCDR) 1, a HCDR2 and a HCDR3 of a heavy chain variable region (VH) of SEQ ID NO: 137 and a light chain complementarity determining region (LCDR) 1, a LCDR2 and a LCDR3 of a light chain variable region (VL) of SEQ ID NO: 138; or the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 137 and the LCDR1, the LCDR2 and the LCDR3 of the VL of SEQ ID NO: 138; or the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 162 and the LCDR1, the LCDR2 and the LCDR3 of the VL of SEQ ID
  • the disclosure provides an isolated multispecific protein comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises a heavy chain complementarity determining region (HCDR) 1, a HCDR2 and a HCDR3 of a heavy chain variable region (VH) of SEQ ID NO: 162 and a light chain complementarity determining region (LCDR) 1, a LCDR2 and a LCDR3 of a light chain variable region (VL) of SEQ ID NO: 163.
  • HCDR heavy chain complementarity determining region
  • VH heavy chain variable region
  • LCDR light chain complementarity determining region
  • the disclosure also provides an isolated multispecific protein comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises a heavy chain variable region (VH) of SEQ ID NO: 75 and a light chain variable region (VL) of SEQ ID NO: 74.
  • hK2 kallikrein related peptidase 2
  • the disclosure also provides isolated multispecific protein comprising an antigen binding domain that bind hK2 comprising certain VH and VL amino acid sequences.
  • the disclosure also provides an isolated chimeric antigen receptor (CAR) comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2).
  • CAR chimeric antigen receptor
  • the disclosure also provides an isolated chimeric antigen receptor (CAR) comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises a heavy chain complementarity determining region (HCDR) 1, a HCDR2 and a HCDR3 of a heavy chain variable region (VH) of SEQ ID NO: 137 and a light chain complementarity determining region (LCDR) 1, a LCDR2 and a LCDR3 of a light chain variable region (VL) of SEQ ID NO: 138; or the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 137 and the LCDR1, the LCDR2 and the LCDR3 of the VL of SEQ ID NO: 138; or the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 162 and the LCDR1, the LCDR2 and the LCDR3 of
  • the disclosure provides an isolated chimeric antigen receptor (CAR) comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises a heavy chain complementarity determining region (HCDR) 1, a HCDR2 and a HCDR3 of a heavy chain variable region (VH) of SEQ ID NO: 162 and a light chain complementarity determining region (LCDR) 1, a LCDR2 and a LCDR3 of a light chain variable region (VL) of SEQ ID NO: 163.
  • CAR chimeric antigen receptor
  • the disclosure also provides an isolated chimeric antigen receptor (CAR) comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises a heavy chain variable region (VH) of SEQ ID NO: 75 and a light chain variable region (VL) of SEQ ID NO: 74.
  • CAR chimeric antigen receptor
  • the disclosure also provides an isolated multispecific protein comprising a first antigen binding domain that binds hK2 and a second antigen binding domain that binds a lymphocyte antigen (such as CD3).
  • the present the disclosure provides an isolated multispecific protein comprising a first antigen binding domain that binds hK2 and a second antigen binding domain that binds a lymphocyte antigen, wherein the isolated multispecific protein is an isolated anti hK2/anti CD3 protein.
  • the disclosure also provides an immunoconjugate comprising the isolated antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides an immunoconjugate comprising the isolated protein comprising the antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides an immunoconjugate comprising the isolated multispecific protein comprising the antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides an immunoconjugate comprising the isolated CAR comprising the antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides a pharmaceutical composition comprising the isolated antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides a pharmaceutical composition comprising the isolated protein comprising the antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides a pharmaceutical composition comprising the isolated multispecific protein comprising the antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides a pharmaceutical composition comprising the isolated multispecific protein of the disclosure.
  • the disclosure also provides a pharmaceutical composition comprising the isolated CAR comprising the antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides an isolated polynucleotide encoding the isolated antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides an isolated polynucleotide encoding the isolated protein comprising the antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides an isolated polynucleotide encoding the isolated multispecific protein comprising the antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides an isolated polynucleotide encoding the isolated CAR comprising the antigen binding domain that binds hK2 of the disclosure.
  • the disclosure also provides a vector comprising the polynucleotide of the disclosure.
  • the disclosure also provides a host cell comprising the polynucleotide or the vector of the disclosure.
  • the disclosure also provides a method of treating a hK2 expressing cancer in a subject, comprising administering a therapeutically effective amount of the antigen binding domain that binds hK2, the protein comprising the antigen binding domain that binds hK2, the multispecific protein comprising the antigen binding domain that binds hK2, the CAR-T comprising the antigen binding domain that binds hK2, the immunoconjugate of the disclosure or the pharmaceutical composition of the disclosure to the subject in need thereof for a time sufficient to treat the hK2 expressing cancer.
  • the disclosure also provides a method of reducing the amount of hK2 expressing tumor cells in a subject, comprising administering to the subject the antigen binding domain that binds hK2, the protein comprising the antigen binding domain that binds hK2, the multispecific protein comprising the antigen binding domain that binds hK2, the CAR-T comprising the antigen binding domain that binds hK2, the immunoconjugate of the disclosure or the pharmaceutical composition of the disclosure for a time sufficient to reduce the amount of hK2 expressing tumor cells.
  • the disclosure also provides a method of preventing establishment of a hK2 expressing cancer in a subject, comprising administering the antigen binding domain that binds hK2, the protein comprising the antigen binding domain that binds hK2, the multispecific protein comprising the antigen binding domain that binds hK2, the CAR-T comprising the antigen binding domain that binds hK2, the immunoconjugate of the disclosure or the pharmaceutical composition of the disclosure to the subject in need thereof to prevent establishment of the hK2 expressing cancer in the subject.
  • the disclosure also provides a method of treating a noncancerous condition in a subject at risk of developing a hK2 expressing cancerous condition, comprising administering the antigen binding domain that binds hK2, the protein comprising the antigen binding domain that binds hK2, the multispecific protein comprising the antigen binding domain that binds hK2, the CAR-T comprising the antigen binding domain that binds hK2, the immunoconjugate of the disclosure or the pharmaceutical composition of the disclosure to the subject in need thereof to treat the noncancerous condition.
  • the disclosure also provides a method of treating prostate cancer in a subject, comprising administering a therapeutically effective amount of the antigen binding domain that binds hK2, the protein comprising the antigen binding domain that binds hK2, the multispecific protein comprising the antigen binding domain that binds hK2, the CAR-T comprising the antigen binding domain that binds hK2, the immunoconjugate of the disclosure or the pharmaceutical composition of the disclosure to the subject in need thereof for a time sufficient to treat the prostate cancer.
  • the disclosure also provides a method of treating breast cancer in a subject, comprising administering a therapeutically effective amount of the antigen binding domain that binds hK2, the protein comprising the antigen binding domain that binds hK2, the multispecific protein comprising the antigen binding domain that binds hK2, the CAR-T comprising the antigen binding domain that binds hK2, the immunoconjugate of the disclosure or the pharmaceutical composition of the disclosure to the subject in need thereof for a time sufficient to treat the breast cancer.
  • the disclosure also provides a method of detecting prostate cancer or breast cancer in a subject, comprising administering to the subject the immunoconjugate of the disclosure, and detecting binding of the immunoconjugate to hK2, thereby detecting prostate cancer or breast cancer.
  • the disclosure also provides a kit comprising the antigen binding domain that binds hK2, the protein comprising the antigen binding domain that binds hK2, the multispecific protein comprising the antigen binding domain that binds hK2, the CAR-T comprising the antigen binding domain that binds hK2, the immunoconjugate of the disclosure or the pharmaceutical composition of the disclosure.
  • the disclosure also provides an anti-idiotypic antibody binding to the antigen binding domain that binds hK2 of the disclosure
  • the disclosure also provides a chimeric antigen receptor (CAR) comprising: an extracellular domain comprising an antigen binding domain that binds hK2; a transmembrane domain; and an intracellular signaling domain optionally comprising at least one co-stimulatory domain.
  • CAR chimeric antigen receptor
  • TM transmembrane
  • FIG. 1 shows the sequence alignment of the VH domains of mu11B6 (SEQ ID NO: 125), hu11B6 (SEQ ID NO: 5), KL2B357 (SEQ ID NO: 159), KL2B358 (SEQ ID NO: 161), KL2B359 (SEQ ID NO: 139), KL2B360 (SEQ ID NO: 159), HCF3 (SEQ ID NO: 6) and HCG5 (SEQ ID NO: 4).
  • FIG. 2 shows the sequence alignment of the VL domains of mu11B6 (SEQ ID NO: 124), hu11B6 (SEQ ID NO: 2), KL2B357 (SEQ ID NO: 160), KL2B358 (SEQ ID NO: 140), KL2B359 (SEQ ID NO: 140), KL2B360 (SEQ ID NO: 140), LDC6 (SEQ ID NO: 1) and LCB7 (SEQ ID NO: 3).
  • FIG. 3 shows the binding epitopes of selected hK2 antibodies mapped onto the sequence of hK2 antigen. The figure discloses each sequence as SEQ ID NO: 467.
  • FIGS. 4 A and 4 B show binding of hybridoma supernatants to primary human T cells.
  • Clone UCHT1 was used as a positive control ( FIG. 1 B ); mouse IgG1 isotype (mIgG1) was used as a negative control.
  • FIG. 5 shows binding of anti-CD3 scFv variants, expressed in E. coli , to CD3.
  • FIG. 6 shows the alignment of the VL regions of CD3B815 (SEQ ID NO: 249), CD3W244 (SEQ ID NO: 250), CD3W245 (SEQ ID NO: 251), CD3W246 (SEQ ID NO: 252), CD3W247 (SEQ ID NO: 253), and CD3W248 (SEQ ID NO: 254).
  • FIG. 7 shows hydrogen-deuterium exchange mass spectrometry (HDX-MS) of CD3W245 bound to human CD3 ⁇ (CD3 ⁇ :CD3W245) and OKT3 bound to CD3 ⁇ (CD3 ⁇ :OKT).
  • the amino acid sequence shown represent residues 2-93 of the 105 residues of the ECD domain of CD3 ⁇ and corresponds to residue 1-91 of CD3 ⁇ SEQ ID NO: 340
  • Single underline indicates segments with 10%-30% decrease in deuteration levels and double underline indicates segments with >30% decrease in deuteration levels in the presence of the antibody, as compared to CD3 ⁇ alone.
  • FIG. 8 A shows in vitro target cytotoxicity of KL2B ⁇ CD3 bi-specific molecules measured by incuCyte imaging system in real-time for quantifying target cell death.
  • FIG. 8 B shows in vitro target cytotoxicity of KL2B ⁇ CD3 bi-specific molecules measured by fluorescent caspase 3/7 reagent to measure apoptosis signal from target cell death.
  • FIG. 9 A shows in vitro T cell activation and proliferation by KLK2 ⁇ CD3 bi-specific antibodies by showing the frequency of CD25 positive cells at different doses.
  • FIG. 9 B shows in vitro T cell activation and proliferation by KLK2 ⁇ CD3 bi-specific antibodies by showing the frequency of cells entering into proliferation gate.
  • FIG. 10 A shows in vitro T cell INF- ⁇ release by KLK2 ⁇ CD3 bi-specific antibodies.
  • FIG. 10 B shows in vitro T cell TNF- ⁇ release by KLK2 ⁇ CD3 bi-specific antibodies.
  • FIG. 11 show the cartoon of the design of the hK2 binding chimeric artificial receptors (CAR).
  • the hK2 binding scFv was cloned in either VH-VL or VL-VH orientation in the various CARs.
  • FIG. 12 A and FIG. 12 B show hK2 CAR expression on T cells-surface.
  • Primary human T cells were electroporated with no mRNA (MOCK) or 10 ⁇ g of mRNA expressing either an hK2 scFv CAR or irrelevant control CAR.
  • 24 hours post-electroporation CAR surface expression was measured by flow cytometry following staining with 2 ⁇ g/ml biotinylated L-protein and streptavidin-conjugated PE (top panel) or 2 ⁇ g/ml biotinylated L-protein and streptavidin-conjugated PE (bottom panel) or biotinylated hK2 (1 ⁇ g/ml) and streptavidin-conjugated PE.
  • FIG. 13 shows cytotoxicity of hK2 positive (VCaP, top panel) and negative (DU145, bottom panel) tumor cells by hK2 CAR-T cells in 20-hour flow-based assay at the indicated effector-to-target cell (E/T) ratio.
  • E/T effector-to-target cell
  • FIG. 14 shows real-time hK2 CAR-T cell-mediated cytotoxicity.
  • target cells adhered to the plate and proliferated, increasing the CI readout.
  • T cells were added to target cells, hK2 CAR and control CAR-T cells mediated hK2 positive VCaP cell cytolysis and subsequent progressive decrease in CI at an E/T ratio from 5:1 to 0.156:1.
  • the reduction in CI value after addition of effector cells reflected the loss of viability of target cells.
  • the Y-axis shows the normalized CI generated by the RTCA software and displayed in real time.
  • X-axis is the time of cell culture and treatment time in hour. Mean values of the CI were plotted standard deviation.
  • FIG. 15 shows lack of real-time hK2 CAR-T cell-mediated cytotoxicity of target cells not expressing hK2.
  • target cells adhered to the plate and proliferated, increasing the CI readout.
  • T cells were added to target cells, hK2 CAR-T and control CAR-T cells did not reduce CI after addition which displayed no cytolytic activity.
  • the Y-axis shows the normalized CI generated by the RTCA software and displayed in real time.
  • X-axis is the time of cell culture and treatment time in hour. Mean values of the CI were plotted standard deviation.
  • FIG. 16 shows interferon- ⁇ (IFN- ⁇ ) production by antigen-stimulated hK2 CAR-T cells.
  • IFN- ⁇ interferon- ⁇
  • Supernatant was collected from xCELLigence based killing assay approximately 70 hours co-culture (VCap #5E4, DU145 #5E3).
  • hK2 CAR_LH and Control CAR modified T cells secreted IFN- ⁇ during co-culture with hK2-expressing VCaP cells, but not with hK2-negative DU145 cells.
  • Mean IFN- ⁇ concentration ⁇ standard deviation (pg/ml) from duplicate cultures is shown.
  • FIG. 17 shows expression of hK2 CAR constructs (constructs 1-10) on Jurkat cells containing luciferase gene driven by the signaling-responsive NFAT promoter (JNL cells) transduced with the various hK2 CAR constructs as shown in the Figure. Expression was determined by biotinylated hK2 followed by streptavidin-conjugated PE.
  • FIG. 18 shows binding between the CAR1-0 constructs and its cognate cellular antigen (hK2 on target cells) detected by luciferase expression in the JNL cells upon binding.
  • JNL cells transduced with the indicated CAR constructs (CAR1-10) and un-transduced JNL cells (UTD) were co-cultured with target cells lines (VCaP or DU145 cells) and luciferase activity was measured as luminescence intensity.
  • Constructs were considered active when the luminescence intensity exceeded 1.5-fold the level of UTD cells in the presence of antigen-expressing cells.
  • FIG. 19 shows hK2 CAR1-10 or parental 11B6_HL and 11B6_LH expression on T cell surface.
  • Primary human T cells were transduced with 11B6 thermally stabilized and parental scFv CAR lentivirus (multiplicity of infection (MOI): 3) and CAR expression was determined by biotinylated hK2 (1 ⁇ g/ml) followed by streptavidin-conjugated PE 14 days post transduction.
  • MOI multiplicity of infection
  • FIG. 20 shows percent tumor cell growth inhibition of hK2 positive VCaP cells at effector:target ratio of 1:1 or 0.5:1 by T cells transduced with CAR1-10 or the parental 11B6_HL or 11B6_LH. in the real-time IncuCyte killing assay assessing antigen-dependent cytotoxicity.
  • Tumor cell growth inhibition (%) (Initial Viable Target Cell Number ⁇ Current Viable Target Cell Number)/Initial Viable Cell Number*100(%).
  • FIG. 21 shows percent tumor cell growth inhibition of PC3 cells at effector:target ratio of 1:1 by T cells transduced with CAR1-10 or the parental 11B6_HL or 11B6_LH. in the real-time IncuCyte killing assay assessing antigen-dependent cytotoxicity.
  • Tumor cell growth inhibition (%) (Initial Viable Target Cell Number ⁇ Current Viable Target Cell Number)/Initial Viable Cell Number*100(%).
  • FIG. 22 shows cytokine release by hK2 CAR-T cells.
  • Supernatant collected from overnight (approximately 20 hours) co-culture of hK2 CAR-T cells with VCaP cells at 1:1 of E/T ratio was analyzed using 13-plex Milliplex Human High Sensitivity T cell kit (HSTCMAG28SPMX13).
  • hK2 CAR-T cells secreted cytokines during co-culture with hK2-expressing VCaP cells, but minimally during co-culture with un-transduced T cells (UTD).
  • Mean cytokine concentration ⁇ standard deviation (pg/ml) from duplicate cultures is shown.
  • FIG. 23 shows IFN- ⁇ release by hK2 CAR-T cells.
  • hK2 CAR modified T cells secrete IFN- ⁇ during co-culture with hK2-expressing VCaP cells, but not hK2-negative DU145 cells.
  • Mean IFN- ⁇ concentration ⁇ standard deviation (pg/ml) from duplicate cultures is shown.
  • CD3/28 beads stimulated T cells and T cells only were used as positive and negative controls, respectively.
  • FIGS. 25 A and 25 B shows flow cytometry histograms of CD25 positive CellTrace Violet (CTV) labeled untransduced T cells (T cells only in the Figure) or CAR1-10-transduced CAR-T after 5-day co-culture with VCaP or DU145 cells, or after stimulation with CD3/28 beads.
  • CTV CellTrace Violet
  • FIG. 26 shows that hK2 CAR-T cells proliferated more robustly than CD3/28 beads positive control after 5 days of coculture with VCaP cells.
  • Different CAR constructs engineered T cells had different proliferation activity and displayed different CAR+ T cells counts.
  • the CAR+ T cells counts were based on mean absolute cell count+/ ⁇ SEM from three technical replicates.
  • FIG. 27 shows the surface expression of CAR17 (KL2B413_HL), CAR18 (KL2B413_LH), CAR19 (KL2B359_HL) and CAR20 (HK2B359_LH on the surface of primary T cells.
  • the numbers inside each histogram indicate the percentage of cells expressing the indicated CARs.
  • FIG. 28 shows the surface expression of CAR17 (KL2B413_HL), CAR18 (KL2B413_LH), CAR19 (KL2B359_HL) and CAR20 (KL2B359_LH) on JNL cells.
  • FIG. 29 shows the relative light units (RLU) resulting from luciferase expression in JNL cells mediated by binding of the test CAR-T to its cognate receptor on various target cells as indicated in the Figure.
  • JNL cells containing the indicated CAR clones and untransduced JNL cells (UTD) were co-cultured with target cells lines (VCaP, LNCaP/hK2, LNCaP, C4-2B, 22Rv1 or DU145 cells) and luciferase activity was measured as luminescence intensity (RLU, relative light units).
  • KL2B413_HL CAR17
  • KL2B413_LH CAR18
  • HL2B359_HL CAR19
  • KL2B359_LH CAR20.
  • FIG. 30 shows percent tumor cell growth inhibition of hK2 positive VCaP cells by CAR-T cells transduced with CAR17 (B413HL in the Figure), CAR18 (B413LH in the Figure), CAR19 (B359HL in the Figure) and CAR20 (B359LH in the Figure) in the real-time IncuCyte killing assay assessing antigen-dependent cytotoxicity.
  • Tumor cell growth inhibition (%) (Initial Viable Target Cell Number ⁇ Current Viable Target Cell Number)/Initial Viable Cell Number*100(%).
  • FIG. 31 shows percent tumor cell growth inhibition of hK2 negative DU145 cells by CAR-T cells transduced with CAR17 (B413HL in the Figure), CAR18 (B413LH in the Figure), CAR19 (B359HL in the Figure) and CAR20 (B359LH in the Figure) in the real-time IncuCyte killing assay assessing antigen-dependent cytotoxicity.
  • Tumor cell growth inhibition (%) (Initial Viable Target Cell Number ⁇ Current Viable Target Cell Number)/Initial Viable Cell Number*100(%).
  • FIG. 32 shows IFN- ⁇ production by CAR-T cells transduced with CAR17 (KLK2B413HL in the Figure), CAR18 (KLK2B413LH in the Figure), CAR19 (KLK2B359HL in the Figure) and CAR20 (KLK2B359LH in the Figure) or untransduced T cells (UTD) in co-cultures with cells indicated in the Figure.
  • FIG. 33 A and FIG. 33 B show that co-culture of CAR-T cells transduced with CAR17 (B413HL in the Figure), CAR18 (B413LH in the Figure), CAR19 (B359HL in the Figure) and CAR20 (B359LH in the Figure) and VCap cells result in increase in CD107a+hK2-CAR-T+ cells, indicative of immune cell activation and cytotoxic degranulation, whereas co-culture with hK2 negative DU145 cells had no effect.
  • FIG. 34 A and FIG. 34 B show flow cytometry histograms of CellTrace Violet (CTV) labeled untransduced T cells (T cells only in the Figure) or CAR-T cells transduced with CAR17 (KLB413HL in the Figure), CAR18 (KLB413LH in the Figure), CAR19 (KLB359HL in the Figure) and CAR20 (KLB359LH in the Figure) after 5-day co-culture with VCAp or DU145 cells.
  • CTV CellTrace Violet
  • FIG. 35 shows the percentage of proliferating cells in co-cultures of CellTrace Violet (CTV) labeled untransduced T cells (T cells only in the Figure) or CAR-T cells transduced with CAR17 (KLB413HL in the Figure), CAR18 (KLB413LH in the Figure), CAR19 (KLB359HL in the Figure) and CAR20 (KLB359LH in the Figure) after 5-day co-culture with VCAP or DU145 cells.
  • CTV CellTrace Violet
  • FIG. 36 A and FIG. 36 B show flow cytometry histograms of CTV+CD25+ CAR-T cells transduced with CAR17 (KLB413HL in the Figure), CAR18 (KLB413LH in the Figure), CAR19 (KLB359HL in the Figure) and CAR20 (KLB359LH in the Figure) after 5-day co-culture with VCaP or DU145 cells.
  • FIG. 37 shows the percentage of CTV expressing un-transduced T cells (UTD) or CAR-T cells transduced with CAR17 (KLB413HL in the Figure), CAR18 (KLB413LH in the Figure), CAR19 (KLB359HL in the Figure) and CAR20 (KLB359LH in the Figure) after 5-day co-culture with VCaPs or DU145 cells, alone (T cells only) or after CD2/28 bead stimulation.
  • FIG. 38 A- 38 F shows the binding paratope of selected anti-hK2 antibodies and selected anti-hK2/CD3 bispecific antibodies. Underlined sequences indicate CDR regions and highlighted sequences indicate paratope regions.
  • FIG. 38 A discloses SEQ ID NOS 219 and 220, respectively, in order of appearance.
  • FIG. 38 B discloses SEQ ID NOS 213 and 224, respectively, in order of appearance.
  • FIG. 38 C discloses SEQ ID NOS 203 and 215, respectively, in order of appearance.
  • FIG. 38 D discloses SEQ ID NOS 468 and 469, respectively, in order of appearance.
  • FIG. 38 E discloses SEQ ID NOS 354 and 221, respectively, in order of appearance.
  • FIG. 38 F discloses SEQ ID NOS 356 and 222, respectively, in order of appearance.
  • FIG. 39 A shows in vivo efficacy of KLK2 ⁇ CD3 bi-specific antibody in VCaP xenograft mouse model and cytokine profile.
  • Three KLK2 ⁇ CD3 bispecific antibodies were tested at 3 dose levels: 5 mg/kg, 1 mg/kg, and 0.2 mg/kg. Tumor growth inhibition was plotted based on tumor volume measurement.
  • FIG. 39 B shows in vivo efficacy of KLK2 ⁇ CD3 bi-specific antibody in VCaP xenograft mouse model and cytokine profile.
  • 100 ⁇ l blood samples were collected from animals via retro-orbital bleed 6 hours post first dose. Plasma was separated from blood sample by high speed centrifugation. A Luminex assay was carried out to quantify IFN- ⁇ and TNF- ⁇ concentrations at different KLK2 bi-specific doses.
  • transitional terms “comprising,” “consisting essentially of,” and “consisting of” are intended to connote their generally accepted meanings in the patent vernacular; that is, (i) “comprising,” which is synonymous with “including,” “containing,” or “characterized by,” is inclusive or open-ended and does not exclude additional, unrecited elements or method steps; (ii) “consisting of” excludes any element, step, or ingredient not specified in the claim; and (iii) “consisting essentially of” limits the scope of a claim to the specified materials or steps “and those that do not materially affect the basic and novel characteristic(s)” of the claimed invention.
  • Embodiments described in terms of the phrase “comprising” (or its equivalents) also provide as embodiments those independently described in terms of “consisting of” and “consisting essentially of.”
  • “About” means within an acceptable error range for the particular value as determined by one of ordinary skill in the art, which will depend in part on how the value is measured or determined, i.e., the limitations of the measurement system. Unless explicitly stated otherwise within the Examples or elsewhere in the Specification in the context of a particular assay, result or embodiment, “about” means within one standard deviation per the practice in the art, or a range of up to 5%, whichever is larger.
  • Activation or “stimulation” or “activated” or “stimulated” refers to induction of a change in the biologic state of a cell resulting in expression of activation markers, cytokine production, proliferation or mediating cytotoxicity of target cells.
  • Cells may be activated by primary stimulatory signals.
  • Co-stimulatory signals can amplify the magnitude of the primary signals and suppress cell death following initial stimulation resulting in a more durable activation state and thus a higher cytotoxic capacity.
  • a “co-stimulatory signal” refers to a signal, which in combination with a primary signal, such as TCR/CD3 ligation, leads to T cell and/or NK cell proliferation and/or upregulation or downregulation of key molecules.
  • “Alternative scaffold” refers to a single chain protein framework that contains a structured core associated with variable domains of high conformational tolerance.
  • the variable domains tolerate variation to be introduced without compromising scaffold integrity, and hence the variable domains can be engineered and selected for binding to a specific antigen.
  • Antibody-dependent cellular cytotoxicity refers to the mechanism of inducing cell death that depends upon the interaction of antibody-coated target cells with effector cells possessing lytic activity, such as natural killer cells (NK), monocytes, macrophages and neutrophils via Fc gamma receptors (Fc ⁇ R) expressed on effector cells.
  • lytic activity such as natural killer cells (NK), monocytes, macrophages and neutrophils via Fc gamma receptors (Fc ⁇ R) expressed on effector cells.
  • ADCP antibody-dependent cellular phagocytosis
  • Antigen refers to any molecule (e.g., protein, peptide, polysaccharide, glycoprotein, glycolipid, nucleic acid, portions thereof, or combinations thereof) capable of being bound by an antigen binding domain or a T-cell receptor capable of mediating an immune response.
  • exemplary immune responses include antibody production and activation of immune cells, such as T cells, B cells or NK cells.
  • Antigens may be expressed by genes, synthetized, or purified from biological samples such as a tissue sample, a tumor sample, a cell or a fluid with other biological components, organisms, subunits of proteins/antigens, killed or inactivated whole cells or lysates.
  • Antigen binding fragment or “antigen binding domain” refers to a portion of the protein that binds an antigen.
  • Antigen binding fragments may be synthetic, enzymatically obtainable or genetically engineered polypeptides and include portions of an immunoglobulin that bind an antigen, such as the VH, the VL, the VH and the VL, Fab, Fab′, F(ab′) 2 , Fd and Fv fragments, domain antibodies (dAb) consisting of one VH domain or one VL domain, shark variable IgNAR domains, camelized VH domains, VHH domains, minimal recognition units consisting of the amino acid residues that mimic the CDRs of an antibody, such as FR3-CDR3-FR4 portions, the HCDR1, the HCDR2 and/or the HCDR3 and the LCDR1, the LCDR2 and/or the LCDR3, alternative scaffolds that bind an antigen, and multispecific proteins comprising the antigen binding fragments.
  • Antigen binding fragments may be linked together via a synthetic linker to form various types of single antibody designs where the VH/VL domains may pair intramolecularly, or intermolecularly in those cases when the VH and VL domains are expressed by separate single chains, to form a monovalent antigen binding domain, such as single chain Fv (scFv) or diabody.
  • Antigen binding fragments may also be conjugated to other antibodies, proteins, antigen binding fragments or alternative scaffolds which may be monospecific or multispecific to engineer bispecific and multispecific proteins.
  • Antibodies is meant in a broad sense and includes immunoglobulin molecules including monoclonal antibodies including murine, human, humanized and chimeric monoclonal antibodies, antigen binding fragments, multispecific antibodies, such as bispecific, trispecific, tetraspecific, dimeric, tetrameric or multimeric antibodies, single chain antibodies, domain antibodies and any other modified configuration of the immunoglobulin molecule that comprises an antigen binding site of the required specificity.
  • Fully length antibodies are comprised of two heavy chains (HC) and two light chains (LC) inter-connected by disulfide bonds as well as multimers thereof (e.g. IgM).
  • Each heavy chain is comprised of a heavy chain variable region (VH) and a heavy chain constant region (comprised of domains CH1, hinge, CH2 and CH3).
  • Each light chain is comprised of a light chain variable region (VL) and a light chain constant region (CL).
  • the VH and the VL regions may be further subdivided into regions of hypervariability, termed complementarity determining regions (CDR), interspersed with framework regions (FR).
  • CDR complementarity determining regions
  • FR framework regions
  • Each VH and VL is composed of three CDRs and four FR segments, arranged from amino-to-carboxy-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3 and FR4.
  • Immunoglobulins may be assigned to five major classes, IgA, IgD, IgE, IgG and IgM, depending on the heavy chain constant domain amino acid sequence.
  • IgA and IgG are further sub-classified as the isotypes IgA1, IgA2, IgG1, IgG2, IgG3 and IgG4.
  • Antibody light chains of any vertebrate species may be assigned to one of two clearly distinct types, namely kappa ( ⁇ ) and lambda ( ⁇ ), based on the amino acid sequences of their constant domains.
  • Bispecific refers to a molecule (such as an antibody) that specifically binds two distinct antigens or two distinct epitopes within the same antigen.
  • the bispecific molecule may have cross-reactivity to other related antigens, for example to the same antigen from other species (homologs), such as human or monkey, for example Macaca cynomolgus (cynomolgus, cyno) or Pan troglodytes , or may bind an epitope that is shared between two or more distinct antigens.
  • Bispecific anti-hK2/anti-CD3 antibody refers to an antibody that binds hk2 and CD3 and that comprises at least one binding domain specifically binding hK2 and at least one binding domain specifically binding CD3.
  • the domains specifically binding hK2 and CD3 are typically V H /V L pairs.
  • the bispecific anti-hk2 ⁇ CD3 antibody may be monovalent in terms of its binding to either hk2 or CD3.
  • Cancer refers to a broad group of various diseases characterized by the uncontrolled growth of abnormal cells in the body. Unregulated cell division and growth results in the formation of malignant tumors that invade neighboring tissues and may also metastasize to distant parts of the body through the lymphatic system or bloodstream.
  • a “cancer” or “cancer tissue” can include a tumor.
  • CAR Chimeric antigen receptor
  • a cell-surface receptor comprising an extracellular target-binding domain, a transmembrane domain and an intracellular signaling domain, all in a combination that is not naturally found together on a single protein. This includes receptors wherein the extracellular domain and the intracellular signaling domain are not naturally found together on a single receptor protein. CARs are intended primarily for use with lymphocyte such as T cells and natural killer (NK) cells.
  • NK natural killer
  • complement receptors e.g., CR3
  • CDR complementarity determining regions
  • CDR CDR
  • HCDR1 CDR1
  • HCDR2 CDR3
  • LCDR1 CDR2
  • LCDR3 CDR3
  • CD3 refers to an antigen which is expressed on T cells as part of the multimolecular T cell receptor (TCR) complex and which consists of a homodimer or heterodimer formed from the association of two or four receptor chains: CD3 epsilon, CD3 delta, CD3 zeta and CD3 gamma.
  • Human CD3 epsilon comprises the amino acid sequence of SEQ ID NO: 442. All references to proteins, polypeptides and protein fragments herein are intended to refer to the human version of the respective protein, polypeptide or protein fragment unless explicitly specified as being from a non-human species. Thus, “CD3” means human CD3 unless specified as being from a non-human species, e.g., “mouse CD3” “monkey CD3,” etc.
  • CD3-specific or “specifically binds CD3” or “anti-CD3 antibody” refers to antibodies that bind specifically to the CD3-epsilon polypeptide (SEQ ID NO:442), including antibodies that bind specifically to the CD3-epsilon extracellular domain (ECD) (SEQ ID NO:443).
  • CD3-epsilon together with CD3-gamma, -delta and -zeta, and the T-cell receptor alpha/beta and gamma/delta heterodimers, forms the T-cell receptor-CD3 complex.
  • This complex plays an important role in coupling antigen recognition to several intracellular signal-transduction pathways.
  • the CD3 complex mediates signal transduction, resulting in T cell activation and proliferation. CD3 is required for the immune response.
  • “Decrease,” “lower,” “lessen,” “reduce,” or “abate” refers generally to the ability of a test molecule to mediate a reduced response (i.e., downstream effect) when compared to the response mediated by a control or a vehicle.
  • Exemplary responses are T cell expansion.
  • Decrease may be a statistically significant difference in the measured response between the test molecule and the control (or the vehicle), or a decrease in the measured response, such as a decrease of about 1.1, 1.2, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20 or 30 fold or more, such as 500, 600, 700, 800, 900 or 1000 fold or more (including all integers and decimal points in between and above 1, e.g., 1.5, 1.6, 1.7, 1.8, etc.).
  • “Differentiation” refers to a method of decreasing the potency or proliferation of a cell or moving the cell to a more developmentally restricted state.
  • Encode refers to the inherent property of specific sequences of nucleotides in a polynucleotide, such as a gene, a cDNA, or an mRNA, to serve as templates for synthesis of other polymers and macromolecules in biological processes having either a defined sequence of nucleotides (e.g., rRNA, tRNA and mRNA) or a defined sequence of amino acids and the biological properties resulting therefrom.
  • a gene, cDNA, or RNA encodes a protein if transcription and translation of mRNA corresponding to that gene produces the protein in a cell or other biological system.
  • Both the coding strand, the nucleotide sequence of which is identical to the mRNA sequence, and the non-coding strand, used as the template for transcription of a gene or cDNA, can be referred to as encoding the protein or other product of that gene or cDNA.
  • “Enhance,” “promote,” “increase,” “expand” or “improve” refers generally to the ability of a test molecule to mediate a greater response (i.e., downstream effect) when compared to the response mediated by a control or a vehicle.
  • Exemplary responses are T cell expansion, T cell activation or T-cell mediated tumor cell killing or binding of a protein to its antigen or receptor, enhanced binding to a Fc ⁇ or enhanced Fc effector functions such as enhanced ADCC, CDC and/or ADCP.
  • Epitope refers to a portion of an antigen to which an antibody specifically binds. Epitopes typically consist of chemically active (such as polar, non-polar or hydrophobic) surface groupings of moieties such as amino acids or polysaccharide side chains and may have specific three-dimensional structural characteristics, as well as specific charge characteristics. An epitope may be composed of contiguous and/or discontinuous amino acids that form a conformational spatial unit. For a discontinuous epitope, amino acids from differing portions of the linear sequence of the antigen come in close proximity in 3-dimensional space through the folding of the protein molecule. Antibody “epitope” depends on the methodology used to identify the epitope.
  • “Express” and “expression” refers the to the well-known transcription and translation occurring in cells or in vitro.
  • the expression product e.g., the protein, is thus expressed by the cell or in vitro and may be an intracellular, extracellular or a transmembrane protein.
  • “Expression vector” refers to a vector that can be utilized in a biological system or in a reconstituted biological system to direct the translation of a polypeptide encoded by a polynucleotide sequence present in the expression vector.
  • dAb or “dAb fragment” refers to an antibody fragment composed of a VH domain (Ward et al., Nature 341:544 546 (1989)).
  • Fab or “Fab fragment” refers to an antibody fragment composed of VH, CH1, VL and CL domains.
  • F(ab′) 2 or “F(ab′) 2 fragment” refers to an antibody fragment containing two Fab fragments connected by a disulfide bridge in the hinge region.
  • Fd or “Fd fragment” refers to an antibody fragment composed of VH and CH1 domains.
  • Fc polypeptide of a dimeric Fc refers to one of the two polypeptide forming the dimeric Fc domain.
  • an Fc polypeptide of a dimeric IgG FC comprises an IgG CH2 and an IgG CH3 constant domain sequence).
  • “Full length antibody” is comprised of two heavy chains (HC) and two light chains (LC) inter-connected by disulfide bonds as well as multimers thereof (e.g. IgM).
  • Each heavy chain is comprised of a heavy chain variable domain (VH) and a heavy chain constant domain, the heavy chain constant domain comprised of subdomains CH1, hinge, CH2 and CH3.
  • Each light chain is comprised of a light chain variable domain (VL) and a light chain constant domain (CL).
  • the VH and the VL may be further subdivided into regions of hypervariability, termed complementarity determining regions (CDR), interspersed with framework regions (FR).
  • CDR complementarity determining regions
  • FR framework regions
  • Each VH and VL is composed of three CDRs and four FR segments, arranged from amino-to-carboxy-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3 and FR4.
  • Geneetic modification refers to the introduction of a “foreign” (i.e., extrinsic or extracellular) gene, DNA or RNA sequence to a host cell, so that the host cell will express the introduced gene or sequence to produce a desired substance, typically a protein or enzyme coded by the introduced gene or sequence.
  • the introduced gene or sequence may also be called a “cloned” or “foreign” gene or sequence, may include regulatory or control sequences operably linked to polynucleotide encoding the chimeric antigen receptor, such as start, stop, promoter, signal, secretion, or other sequences used by a cell's genetic machinery.
  • the gene or sequence may include nonfunctional sequences or sequences with no known function.
  • a host cell that receives and expresses introduced DNA or RNA has been “genetically engineered.”
  • the DNA or RNA introduced to a host cell can come from any source, including cells of the same genus or species as the host cell, or from a different genus or species.
  • Heterologous refers to two or more polynucleotides or two or more polypeptides that are not found in the same relationship to each other in nature.
  • Heterologous polynucleotide refers to a non-naturally occurring polynucleotide that encodes two or more neoantigens as described herein.
  • Heterologous polypeptide refers to a non-naturally occurring polypeptide comprising two or more neoantigen polypeptides as described herein.
  • Het cell refers to any cell that contains a heterologous nucleic acid.
  • An exemplary heterologous nucleic acid is a vector (e.g., an expression vector).
  • Human antibody refers to an antibody that is optimized to have minimal immune response when administered to a human subject. Variable regions of human antibody are derived from human immunoglobulin sequences. If human antibody contains a constant region or a portion of the constant region, the constant region is also derived from human immunoglobulin sequences. Human antibody comprises heavy and light chain variable regions that are “derived from” sequences of human origin if the variable regions of the human antibody are obtained from a system that uses human germline immunoglobulin or rearranged immunoglobulin genes. Such exemplary systems are human immunoglobulin gene libraries displayed on phage, and transgenic non-human animals such as mice or rats carrying human immunoglobulin loci.
  • Human antibody typically contains amino acid differences when compared to the immunoglobulins expressed in humans due to differences between the systems used to obtain the human antibody and human immunoglobulin loci, introduction of somatic mutations or intentional introduction of substitutions into the frameworks or CDRs, or both.
  • “human antibody” is at least about 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% identical in amino acid sequence to an amino acid sequence encoded by human germline immunoglobulin or rearranged immunoglobulin genes.
  • human antibody may contain consensus framework sequences derived from human framework sequence analyses, for example as described in Knappik et al., (2000) J Mol Biol 296:57-86, or a synthetic HCDR3 incorporated into human immunoglobulin gene libraries displayed on phage, for example as described in Shi et al., (2010) J Mol Biol 397:385-96, and in Int. Patent Publ. No. WO2009/085462. Antibodies in which at least one CDR is derived from a non-human species are not included in the definition of “human antibody”.
  • Humanized antibody refers to an antibody in which at least one CDR is derived from non-human species and at least one framework is derived from human immunoglobulin sequences. Humanized antibody may include substitutions in the frameworks so that the frameworks may not be exact copies of expressed human immunoglobulin or human immunoglobulin germline gene sequences.
  • “In combination with” means that two or more therapeutic agents are be administered to a subject together in a mixture, concurrently as single agents or sequentially as single agents in any order.
  • Intracellular signaling domain or “cytoplasmic signaling domain” refers to an intracellular portion of a molecule. It is the functional portion of the protein which acts by transmitting information within the cell to regulate cellular activity via defined signaling pathways by generating second messengers or functioning as effectors by responding to such messengers.
  • the intracellular signaling domain generates a signal that promotes an immune effector function of the CAR containing cell, e.g., a CAR-T cell.
  • Isolated refers to a homogenous population of molecules (such as synthetic polynucleotides or polypeptides) which have been substantially separated and/or purified away from other components of the system the molecules are produced in, such as a recombinant cell, as well as a protein that has been subjected to at least one purification or isolation step.
  • molecules such as synthetic polynucleotides or polypeptides
  • isolated refers to a molecule that is substantially free of other cellular material and/or chemicals and encompasses molecules that are isolated to a higher purity, such as to 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 100% purity.
  • hK2 Kallikrein related peptidase 2
  • hK2 refers to a known protein which is also called kallikrein-2, grandular kallikrein 2, or HK2.
  • hK2 is produced as a preproprotein and cleaved during proteolysis to generate active protease. All hK2 isoforms and variants are encompassed in “hK2”.
  • the amino acid sequences of the various isoforms are retrievable from GenBank accession numbers NP_005542.1, NP_001002231.1 and NP_001243009.
  • the amino acid sequence of a full length hK2 is shown in SEQ ID NO: 62.
  • the sequence includes the signal peptide (residues 1-18) and the pro-peptide region (residues 19-24).
  • Modulate refers to either enhanced or decreased ability of a test molecule to mediate an enhanced or a reduced response (i.e., downstream effect) when compared to the response mediated by a control or a vehicle.
  • “Monoclonal antibody” refers to an antibody obtained from a substantially homogenous population of antibody molecules, i.e., the individual antibodies comprising the population are identical except for possible well-known alterations such as removal of C-terminal lysine from the antibody heavy chain or post-translational modifications such as amino acid isomerization or deamidation, methionine oxidation or asparagine or glutamine deamidation.
  • Monoclonal antibodies typically bind one antigenic epitope.
  • a bispecific monoclonal antibody binds two distinct antigenic epitopes.
  • Monoclonal antibodies may have heterogeneous glycosylation within the antibody population.
  • Monoclonal antibody may be monospecific or multispecific such as bispecific, monovalent, bivalent or multivalent.
  • Multispecific refers to a molecule, such as an antibody that specifically binds two or more distinct antigens or two or more distinct epitopes within the same antigen. Multispecific molecule may have cross-reactivity to other related antigens, for example to the same antigen from other species (homologs), such as human or monkey, for example Macaca fascicularis (cynomolgus, cyno) or Pan troglodytes , or may bind an epitope that is shared between two or more distinct antigens.
  • homologs such as human or monkey, for example Macaca fascicularis (cynomolgus, cyno) or Pan troglodytes , or may bind an epitope that is shared between two or more distinct antigens.
  • NK cell refers to a differentiated lymphocyte with a CD16 + CD56 + and/or CD57 + TCR ⁇ phenotype. NK cells are characterized by their ability to bind to and kill cells that fail to express “self” MHC/HLA antigens by the activation of specific cytolytic enzymes, the ability to kill tumor cells or other diseased cells that express a ligand for NK activating receptors, and the ability to release protein molecules called cytokines that stimulate or inhibit the immune response.
  • “Operatively linked” and similar phrases when used in reference to nucleic acids or amino acids, refers to the operational linkage of nucleic acid sequences or amino acid sequence, respectively, placed in functional relationships with each other.
  • an operatively linked promoter, enhancer elements, open reading frame, 5′ and 3′ UTR, and terminator sequences result in the accurate production of a nucleic acid molecule (e.g., RNA) and in some instances to the production of a polypeptide (i.e., expression of the open reading frame).
  • Operatively linked peptide refers to a peptide in which the functional domains of the peptide are placed with appropriate distance from each other to impart the intended function of each domain.
  • paratope refers to the area or region of an antibody molecule which is involved in binding of an antigen and comprise residues that interact with an antigen.
  • a paratope may composed of continuous and/or discontinuous amino acids that form a conformational spatial unit.
  • the paratope for a given antibody can be defined and characterized at different levels of details using a variety of experimental and computational methods.
  • the experimental methods include hydrogen/deuterium exchange mass spectrometry (HX-MS).
  • HX-MS hydrogen/deuterium exchange mass spectrometry
  • “Pharmaceutical combination” refers to a combination of two or more active ingredients administered either together or separately.
  • “Pharmaceutical composition” refers to a composition that results from combining an active ingredient and a pharmaceutically acceptable carrier.
  • “Pharmaceutically acceptable carrier” or “excipient” refers to an ingredient in a pharmaceutical composition, other than the active ingredient, which is nontoxic to a subject.
  • exemplary pharmaceutically acceptable carriers are a buffer, stabilizer or preservative.
  • Polynucleotide or “nucleic acid” refers to a synthetic molecule comprising a chain of nucleotides covalently linked by a sugar-phosphate backbone or other equivalent covalent chemistry.
  • cDNA is a typical example of a polynucleotide.
  • Polynucleotide may be a DNA or a RNA molecule.
  • Prevent,” “preventing,” “prevention,” or “prophylaxis” of a disease or disorder means preventing that a disorder occurs in a subject.
  • “Proliferation” refers to an increase in cell division, either symmetric or asymmetric division of cells.
  • Promoter refers to the minimal sequences required to initiate transcription. Promoter may also include enhancers or repressor elements which enhance or suppress transcription, respectively.
  • Protein or “polypeptide” are used interchangeably herein are refers to a molecule that comprises one or more polypeptides each comprised of at least two amino acid residues linked by a peptide bond. Protein may be a monomer, or may be protein complex of two or more subunits, the subunits being identical or distinct. Small polypeptides of less than 50 amino acids may be referred to as “peptides”.
  • Protein may be a heterologous fusion protein, a glycoprotein, or a protein modified by post-translational modifications such as phosphorylation, acetylation, myristoylation, palmitoylation, glycosylation, oxidation, formylation, amidation, citrullination, polyglutamylation, ADP-ribosylation, pegylation or biotinylation. Protein may be recombinantly expressed.
  • Recombinant refers to polynucleotides, polypeptides, vectors, viruses and other macromolecules that are prepared, expressed, created or isolated by recombinant means.
  • regulatory element refers to any cis- or trans acting genetic element that controls some aspect of the expression of nucleic acid sequences.
  • Relapsed refers to the return of a disease or the signs and symptoms of a disease after a period of improvement after prior treatment with a therapeutic.
  • Refractory refers to a disease that does not respond to a treatment.
  • a refractory disease can be resistant to a treatment before or at the beginning of the treatment, or a refractory disease can become resistant during a treatment.
  • Single chain Fv refers to a fusion protein comprising at least one antibody fragment comprising a light chain variable region (VL) and at least one antibody fragment comprising a heavy chain variable region (VH), wherein the VL and the VH are contiguously linked via a polypeptide linker, and capable of being expressed as a single chain polypeptide.
  • a scFv may have the VL and VH variable regions in either order, e.g., with respect to the N-terminal and C-terminal ends of the polypeptide, the scFv may comprise VL-linker-VH or may comprise VH-linker-VL.
  • (scFv) 2 or “tandem scFv” or “bis-scFv” fragments refers to a fusion protein comprising two light chain variable region (VL) and two heavy chain variable region (VH), wherein the two VL and the two VH regions are contiguously linked via polypeptide linkers, and capable of being expressed as a single chain polypeptide.
  • the two VL and two VH regions fused by peptide linkers form a bivalent molecule VL A -linker-VH A -linker-VL B -linker-VH B to form two binding sites, capable of binding two different antigens or epitopes concurrently.
  • binds refer to a proteinaceous molecule binding to an antigen or an epitope within the antigen with greater affinity than for other antigens.
  • the proteinaceous molecule binds to the antigen or the epitope within the antigen with an equilibrium dissociation constant (K D ) of about 1 ⁇ 10 ⁇ 7 M or less, for example about 5 ⁇ 10 ⁇ 8 M or less, about 1 ⁇ 10 ⁇ 8 M or less, about 1 ⁇ 10 ⁇ 9 M or less, about 1 ⁇ 10 ⁇ 10 M or less, about 1 ⁇ 10 ⁇ 11 M or less, or about 1 ⁇ 10 ⁇ 12 M or less, typically with the K D that is at least one hundred fold less than its K D for binding to a non-specific antigen (e.g., BSA, casein).
  • K D equilibrium dissociation constant
  • specific binding refers to binding of the proteinacous molecule to the prostate neoantigen without detectable binding to a wild-type protein the neoantigen is a variant of.
  • Subject includes any human or nonhuman animal.
  • Nonhuman animal includes all vertebrates, e.g., mammals and non-mammals, such as nonhuman primates, sheep, dogs, cats, horses, cows, chickens, amphibians, reptiles, etc.
  • the terms “subject” and “patient” can be used interchangeably herein.
  • T cell and “T lymphocyte” are interchangeable and used synonymously herein.
  • T cell includes thymocytes, na ⁇ ve T lymphocytes, memory T cells, immature T lymphocytes, mature T lymphocytes, resting T lymphocytes, or activated T lymphocytes.
  • a T cell can be a T helper (Th) cell, for example a T helper 1 (Th1) or a T helper 2 (Th2) cell.
  • Th1 T helper 1
  • Th2 T helper 2
  • the T cell can be a helper T cell (HTL; CD4 + T cell) CD4 + T cell, a cytotoxic T cell (CTL; CD8 + T cell), a tumor infiltrating cytotoxic T cell (TIL; CD8 + T cell), CD4 + CD8 + T cell, or any other subset of T cells.
  • helper T cell CD4 + T cell
  • CTL cytotoxic T cell
  • TIL tumor infiltrating cytotoxic T cell
  • CD4 + CD8 + T cell CD4 + CD8 + T cell, or any other subset of T cells.
  • NKT cells include NK1.1 + and NK1.1 ⁇ , as well as CD4 + , CD4 ⁇ , CD8 + and CD8 ⁇ cells.
  • the TCR on NKT cells is unique in that it recognizes glycolipid antigens presented by the MHC I-like molecule CD Id. NKT cells can have either protective or deleterious effects due to their abilities to produce cytokines that promote either inflammation or immune tolerance. Also included are “gamma-delta T cells ( ⁇ T cells),” which refer to a specialized population that to a small subset of T cells possessing a distinct TCR on their surface, and unlike the majority of T cells in which the TCR is composed of two glycoprotein chains designated ⁇ - and ⁇ -TCR chains, the TCR in ⁇ T cells is made up of a ⁇ -chain and a ⁇ -chain.
  • “Therapeutically effective amount” or “effective amount” used interchangeably herein, refers to an amount effective, at dosages and for periods of time necessary, to achieve a desired therapeutic result.
  • a therapeutically effective amount may vary according to factors such as the disease state, age, sex, and weight of the individual, and the ability of a therapeutic or a combination of therapeutics to elicit a desired response in the individual.
  • Example indicators of an effective therapeutic or combination of therapeutics that include, for example, improved wellbeing of the patient, reduction of a tumor burden, arrested or slowed growth of a tumor, and/or absence of metastasis of cancer cells to other locations in the body.
  • Transduction refers to the introduction of a foreign nucleic acid into a cell using a viral vector.
  • Treat,” “treating” or “treatment” of a disease or disorder such as cancer refers to accomplishing one or more of the following: reducing the severity and/or duration of the disorder, inhibiting worsening of symptoms characteristic of the disorder being treated, limiting or preventing recurrence of the disorder in subjects that have previously had the disorder, or limiting or preventing recurrence of symptoms in subjects that were previously symptomatic for the disorder.
  • Tumor cell or a “cancer cell” refers to a cancerous, pre-cancerous or transformed cell, either in vivo, ex vivo, or in tissue culture, that has spontaneous or induced phenotypic changes. These changes do not necessarily involve the uptake of new genetic material. Although transformation may arise from infection with a transforming virus and incorporation of new genomic nucleic acid, uptake of exogenous nucleic acid or it can also arise spontaneously or following exposure to a carcinogen, thereby mutating an endogenous gene.
  • Transformation/cancer is exemplified by morphological changes, immortalization of cells, aberrant growth control, foci formation, proliferation, malignancy, modulation of tumor specific marker levels, invasiveness, tumor growth in suitable animal hosts such as nude mice, and the like, in vitro, in vivo, and ex vivo.
  • Variant refers to a polypeptide or a polynucleotide that differs from a reference polypeptide or a reference polynucleotide by one or more modifications, for example one or more substitutions, insertions or deletions.
  • L351Y_F405A_Y407V refers to L351Y, F405A and Y407V mutations in one immunoglobulin constant region.
  • L351Y_F405A_Y407V/T394W refers to L351Y, F405A and Y407V mutations in the first Ig constant region and T394W mutation in the second Ig constant region, which are present in one multimeric protein.
  • VHH refers to a single-domain antibody or nanobody, exclusively composed of the antigen binding domain of a heavy chain.
  • a VHH single domain antibody lacks the light chain and the CH1 domain of the heavy chain of conventional Fab region.
  • the disclosure provides antigen binding domains that bind hK2, monospecific and multispecific proteins (particularly bispecific proteins) comprising the antigen binding domains that bind hK2, chimeric antigen receptors (CAR) comprising the antigen binding domains that bind hK2, polynucleotides encoding the foregoing, vectors, host cells and methods of making and using the foregoing.
  • the antigen binding domains that bind hK2 identified herein demonstrated improved properties in terms of improved thermostability.
  • the multispecific proteins disclosed herein may be particularly effective at mediating T cell mediated cytotoxicity, promoting T cell activation and proliferation, increasing T cell cytokine release and/or displaying increased anti-tumor efficacy.
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 binds to an epitope on hK2 set forth in SEQ ID NO: 111, 112, 113, 114, or 115.
  • hK2 kallikrein related peptidase 2
  • the antigen binding domain that binds hK2 binds to an epitope on hK2 set forth in SEQ ID NOs: 111 and 112.
  • the antigen binding domain that binds hK2 binds to an epitope on hK2 set forth in SEQ ID NOs: 113, 114 and 115.
  • the invention also provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antibody or the antigen binding fragment thereof binds within residues KVTEF (SEQ ID NO: 111) or HYRKW (SEQ ID NO: 112) or SHGWAH (SEQ ID NO: 113) or RHNLFEPEDTGQRVP (SEQ ID NO: 114) or GWGSIEPEE (SEQ ID NO: 115) of hK2.
  • the invention also provides an isolated protein comprising an antigen binding domain that binds hK2, wherein said antigen binding domain binds to hK2 within epitopes having sequences of KVTEF (SEQ ID NO: 111) and HYRKW (SEQ ID NO: 112).
  • An H/D exchange assay may be used to determine the residues within hK2 to which an antibody binds.
  • recombinantly expressed soluble hK2 is incubated in the presence or absence of the antibody in deuterated water for predetermined times resulting in deuterium incorporation at exchangeable hydrogen atoms which are unprotected by the antibody, followed by protease digestion of the protein and analyses of the peptide fragments using LC-MS.
  • H/D exchange assay can be performed using known protocols. An exemplary protocol is described in Example 3.
  • the H/D exchange mixture is quenched by the addition of a quenching buffer (e.g.
  • the invention also provides an isolated protein comprising an antigen binding domain, wherein the antigen binding domain of said reference antibody binds to an epitope on hK2 having a sequence selected from the group consisting of SEQ ID NO: 111, 112, 113, 114, and 115 and wherein the antigen binding domain that binds hK2 competes for binding to hK2 with a reference antibody disclosed herein.
  • the reference antibody comprises:
  • the reference antibody comprises a heavy chain complementarity determining region (HCDR) 1, a HCDR2 and a HCDR3 of a heavy chain variable region (VH) of SEQ ID NO: 162 and a light chain complementarity determining region (LCDR) 1, a LCDR2 and a LCDR3 of a light chain variable region (VL) of SEQ ID NO: 163.
  • HCDR heavy chain complementarity determining region
  • LCDR light chain complementarity determining region
  • Competition for binding of a test antibody that binds to SEQ ID NO: 111, 112, 113, 114, or 115 of soluble hK2 with the reference antibodies of the invention may be assayed in vitro using well known methods. For example, binding of labeled antibody to hK2 the membrane proximal region of hK2 in the presence of an unlabeled reference antibody may be assessed by ELISA, or Bioacore analyses or flow cytometry may be used to demonstrate competition.
  • the test antibody competes for binding to hk2 with the reference antibody when the test antibody inhibits binding of the reference antibody to soluble hK2 by 85% or more, for example 90% or more, or 95% or more.
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises a heavy chain complementarity determining region (HCDR) 1, a HCDR2 and a HCDR3 of a heavy chain variable region (VH) of SEQ ID NO: 137 and a light chain complementarity determining region (LCDR) 1, a LCDR2 and a LCDR3 of a light chain variable region (VL) of SEQ ID NO: 138; or the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 137 and the LCDR1, the LCDR2 and the LCDR3 of the VL of SEQ ID NO: 138 or the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 162 and the LCDR1, the LCDR2 and the LCDR3 of the VL of SEQ ID NO: 163
  • the isolated protein comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 162 and the LCDR1, the LCDR2 and the LCDR3 of the VL of SEQ ID NO: 163.
  • hK2 kallikrein related peptidase 2
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively.
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: of SEQ ID NOs: 194, 195, 172, 173, 174, and 175, respectively.
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises the VH of SEQ ID NOs: 137, 162, 164, 166, 168 or 204 and the VL of SEQ ID NOs: 138, 163, 165, 167 or 169.
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163.
  • the disclosure also provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 95% identical to the VH of SEQ ID NO: 162 and a VL which is at least 95% identical to the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 95% identical to the VH of SEQ ID NO: 162 and a VL which is at least 99% identical to the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 99% identical to the VH of SEQ ID NO: 162 and a VL which is at least 99% identical to the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 99% identical to the VH of SEQ ID NO: 162 and a VL which is at least 95% identical to the VL of SEQ ID NO: 163.
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NOs: 133, 134, 308, 316, 324, 325, 404, 405, 406, 407, 408, or 409.
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 404.
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 405.
  • the disclosure also provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises an amino acid sequence at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the amino acid sequence of SEQ ID NO: 404.
  • the disclosure also provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises an amino acid sequence at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the amino acid sequence of SEQ ID NO: 405.
  • the disclosure also provides an isolated protein comprising an antigen binding domain that binds kallikrein related peptidase 2 (hK2), wherein the antigen binding domain that binds hK2 comprises a heavy chain variable region (VH) of SEQ ID NO: 75 and a light chain variable region (VL) of SEQ ID NO: 74.
  • SEQ ID NO: 75 and SEQ ID NO: 74 represent genus VH and VL amino acid sequences encompassing variants demonstrating improved thermostability when compared to the parent antibody hu11B6.
  • the positions engineered which conferred improved thermostability were residues P41, I49, M70, and A88 in the VH (residue numbering according to the hu11B6_VH of SEQ ID NO: 5) and S80, L82, A88 and Y91 in the VL (residue numbering according to the hu11B6_VL of SEQ ID NO: 2).
  • VH consensus sequence SEQ ID NO: 75 QVQLQESGPGLVKPSX 1 TLSLTCX 2 VS GNSITSDYAWN WIRQX 3 PGKX 4 LEWX 5 G YISYSGSTT YNPSLKSRVTX 6 SRDTSKNQFSLKLSSVTX 7 X 8 D TAVYYCAT GYYYGSGF WGQGTLVTVSS (VL consensus sequence) SEQ ID NO: 74 X 1 IVLTQSPX 2 X 3 LX 4 X 5 SX 6 GERATX 7 X 8 C X 9 ASESVEYFGTSLMH WY QQKPGQPPX 10 LLIY AASNX 11 ES GX 12 PX 13 RFSGSGSGTDFTLTIX 14 SX 15 X 16 QX 17 EDX 18 X 19 VYX 20 C QQTRKVPYT FGX 21 GTKX 22 EIK
  • the disclosure provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises the VH of SEQ ID NOs: 4, 5, 6, 139, 159 or 161 and the VL of SEQ ID NOs: 1, 2, 3, 140 or 160, with the proviso that the antigen binding domain that binds hK2 does not comprise the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 2.
  • the disclosure also provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises
  • the disclosure also provides an isolated protein comprising an antigen binding domain that binds hK2, wherein the antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NOs: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 135, 136, 318, 319, 320, 321, 322 or 323.
  • the antigen binding domain that binds hK2 is a scFv.
  • the antigen binding domain that binds hK2 is a (scFv) 2 .
  • the antigen binding domain that binds hK2 is a Fab.
  • the antigen binding domain that binds hK2 is a F(ab′) 2 .
  • the antigen binding domain that binds hK2 is a Fd.
  • the hK2 antigen binding domain is a dAb.
  • the hK2 antigen binding domain is a VHH.
  • the antigen binding domain that binds hK2 is a Fab.
  • VH and the VL domains identified herein may be incorporated into a scFv format and the binding and thermostability of the resulting scFv to hK2 may be assessed using known methods. Binding may be assessed using ProteOn XPR36, BIAcore 3000 or KinExA instrumentation, ELISA or competitive binding assays known to those skilled in the art. Binding may be evaluated using purified scFvs or E coli supernatants or lysed cells containing the expressed scFv. The measured affinity of a test scFv to hK2 may vary if measured under different conditions (e.g., osmolarity, pH).
  • measurements of affinity and other binding parameters are typically made with standardized conditions and standardized buffers.
  • Thermostability may be evaluated by heating the test scFv at elevated temperatures, such as at 50° C., 55° C. or 60° C. for a period of time, such as 5 minutes (min), 10 min, 15 min, 20 min, 25 min or 30 min and measuring binding of the test scFv to hK2.
  • the scFvs retaining comparable binding to hK2 when compared to a non-heated scFv sample are referred to as being thermostable.
  • the linker is a peptide linker and may include any naturally occurring amino acid.
  • Exemplary amino acids that may be included into the linker are Gly, Ser Pro, Thr, Glu, Lys, Arg, Ile, Leu, His and The.
  • the linker should have a length that is adequate to link the VH and the VL in such a way that they form the correct conformation relative to one another so that they retain the desired activity, such as binding to hK2.
  • the linker is 12 amino acids long. In some embodiments, the linker is 13 amino acids long. In some embodiments, the linker is 14 amino acids long. In some embodiments, the linker is 15 amino acids long. In some embodiments, the linker is 16 amino acids long. In some embodiments, the linker is 17 amino acids long. In some embodiments, the linker is 18 amino acids long. In some embodiments, the linker is 19 amino acids long. In some embodiments, the linker is 20 amino acids long. In some embodiments, the linker is 21 amino acids long. In some embodiments, the linker is 22 amino acids long. In some embodiments, the linker is 23 amino acids long. In some embodiments, the linker is 24 amino acids long.
  • the linker is 25 amino acids long. In some embodiments, the linker is 26 amino acids long. In some embodiments, the linker is 27 amino acids long. In some embodiments, the linker is 28 amino acids long. In some embodiments, the linker is 29 amino acids long. In some embodiments, the linker is 30 amino acids long. In some embodiments, the linker is 31 amino acids long. In some embodiments, the linker is 32 amino acids long. In some embodiments, the linker is 33 amino acids long. In some embodiments, the linker is 34 amino acids long. In some embodiments, the linker is 35 amino acids long. In some embodiments, the linker is 36 amino acids long. In some embodiments, the linker is 37 amino acids long.
  • the linker is 38 amino acids long. In some embodiments, the linker is 39 amino acids long. In some embodiments, the linker is 40 amino acids long. Exemplary linkers that may be used are Gly rich linkers, Gly and Ser containing linkers, Gly and Ala containing linkers, Ala and Ser containing linkers, and other flexible linkers.
  • linker sequences may include portions of immunoglobulin hinge area CL or CH1 derived from any immunoglobulin heavy or light chain isotype.
  • a variety of non-proteinaceous polymers including polyethylene glycol (PEG), polypropylene glycol, polyoxyalkylenes, or copolymers of polyethylene glycol and polypropylene glycol, may find use as linkers.
  • Exemplary linkers that may be used are shown in Table 1. Additional linkers are described for example in Int. Pat. Publ. No. WO2019/060695.
  • the scFv comprises, from the N- to C-terminus, a VH, a first linker (L1) and a VL (VH-L1-VL).
  • the scFv comprises, from the N- to C-terminus, the VL, the L1 and the VH (VL-L1-VH).
  • the L1 comprises the amino acid sequence of SEQ ID NO: 7.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 76.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 77.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 78.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 79.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 80.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 81.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 82.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 83.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 84.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 85.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 86.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 87.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 88.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 89.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 90.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 91.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 92.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 93.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 94.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 95.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 96.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 97.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 98.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 99.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 100.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 101.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 102.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 103.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 104.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 105.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 106.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 107
  • the L1 comprises the amino acid sequence of SEQ ID NO: 108.
  • the L1 comprises or consists of the amino acid sequence of SEQ ID NO: 7.
  • the scFv comprises
  • HCDR heavy chain complementarity determining region
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 141, 142, 143, 144, 145 and 146, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 176, 177, 178, 179, 180 and 181, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 183, 184, 185, 186, and 187, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 188, 189, 190, 182, 470, and 209, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 147, 148, 143, 144, 145 and 146, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 141, 142, 143, 144, 145 and 146, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 194, 195, 172, 173, 174, and 175, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 196, 197, 178, 179, 180, 181, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 198, 199, 184, 185, 186, and 187, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 200, 201, 190, 191, 192, and 193, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 216, 217, 218, 182, 470, and 209, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 63, 65, 66, 67, 69 and 71, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 63, 65, 66, 68, 70 and 71, respectively.
  • the scFv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 72, 73, 66, 67, 69 and 71, respectively.
  • the scFv comprises the VH of SEQ ID NO: 137 and the VL of SEQ ID NO: 138.
  • the scFv comprises the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the scFv comprises the VH of SEQ ID NO: 164 and the VL of SEQ ID NO: 165.
  • the scFv comprises the VH of SEQ ID NO: 166 and the VL of SEQ ID NO: 167.
  • the scFv comprises the VH of SEQ ID NO: 168 and the VL of SEQ ID NO: 169.
  • the scFv comprises the VH of SEQ ID NO: 204 and the VL of SEQ ID NO: 205.
  • the scFv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 160.
  • the scFv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 140.
  • the scFv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 140.
  • the scFv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 140.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 137 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 138.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 164 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 165.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 166 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 167.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 168 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 169.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 204 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 205.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 159 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 160.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 161 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 140.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 139 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 140.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 159 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 140.
  • the scFv comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163.
  • the scFv comprises a VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163.
  • the scFv comprises a VH which is at least 95% identical to the VH of SEQ ID NO: 162 and a VL which is at least 95% identical to the VL of SEQ ID NO: 163.
  • the scFv comprises a VH which is at least 99% identical to the VH of SEQ ID NO: 162 and a VL which is at least 95% identical to the VL of SEQ ID NO: 163.
  • the scFv comprises a VH which is at least 99% identical to the VH of SEQ ID NO: 162 and a VL which is at least 99% identical to the VL of SEQ ID NO: 163.
  • the scFv comprises a VH which is at least 95% identical to the VH of SEQ ID NO: 162 and a VL which is at least 99% identical to the VL of SEQ ID NO: 163.
  • the scFv comprises the amino acid sequence of SEQ ID NOs: 133, 134, 308, 316, 324, 325, 404, 405, 406, 407, 408, or 409.
  • the scFv comprises an amino acid sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the amino acid sequence of SEQ ID NO: 133, 134, 308, 316, 324, 325, 404, 405, 406, 407, 408, or 409.
  • the scFv comprises an amino acid sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the amino acid sequence of SEQ ID NO: 404.
  • the scFv comprises an amino acid sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the amino acid sequence of SEQ ID NO: 405.
  • the scFv comprises the VH of SEQ ID NO: 75 and the VL of SEQ ID NO: 74.
  • the scFv comprises the VH of SEQ ID NOs: 4, 5 or 6 and the VL of SEQ ID NOs: 1, 2 or 3.
  • the scFv comprises the VH of SEQ ID NOs: 4, 5, 6, 139, 159 or 161 and the VL of SEQ ID NOs: 1, 2, 3, 140 or 160, with the proviso that the antigen binding domain that binds hK2 does not comprise the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 2.
  • the scFv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 1.
  • the scFv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 2.
  • the scFv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 3.
  • the scFv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 140.
  • the scFv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 160.
  • the scFv comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 1.
  • the scFv comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 3.
  • the scFv comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 140.
  • the scFv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 1.
  • the scFv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 2.
  • the scFv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 3.
  • the scFv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 140.
  • the scFv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 160.
  • the scFv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 1.
  • the scFv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 2.
  • the scFv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 3.
  • the scFv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 140.
  • the scFv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 160.
  • the scFv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 1.
  • the scFv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 2.
  • the scFv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 3.
  • the scFv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 140.
  • the scFv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 160.
  • the scFv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 1.
  • the scFv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 2.
  • the scFv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 3.
  • the scFv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 140.
  • the scFv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 160.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 8.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 9.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 10.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 11.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 12.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 13.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 14.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 15.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 16.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 17.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 18.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 19.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 20.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 21.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 22.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 23.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 135.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 136.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 318.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 319.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 320.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 321.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 322.
  • the scFv comprises the amino acid sequence of SEQ ID NO: 323.
  • VH and the VL domains identified herein that bind hK2 may also be engineered into Fab, F(ab′) 2 , Fd or Fv format and their binding to hK2 and thermostability may be assessed using the assays described herein.
  • the Fab comprises
  • HCDR heavy chain complementarity determining region
  • the Fab comprises the HCDR1, the HCDR2 and the HCDR3 of the VH of SEQ ID NO: 162 and the LCDR1, the LCDR2 and the LCDR3 of the VL of SEQ ID NO: 163.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 141, 142, 143, 144, 145 and 146, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 176, 177, 178, 179, 180 and 181, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 183, 184, 185, 186, and 187, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 188, 189, 190, 191, 192, and 193, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 206, 207, 208, 182, 470, 209, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 147, 148, 143, 144, 145 and 146, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 194, 195, 172, 173, 174, and 175, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 196, 197, 178, 179, 180, 181, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 198, 199, 184, 185, 186, and 187, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 200, 201, 190, 191, 192, and 193, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 216, 217, 218, 182, 470, and 209, respectively.
  • the Fab comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively or of SEQ ID NOs: 194, 195, 172, 173, 174, and 175, respectively.
  • the Fab comprises the VH of SEQ ID NO: 137 and the VL of SEQ ID NO: 138.
  • the Fab comprises the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the Fab comprises the VH of SEQ ID NO: 164 and the VL of SEQ ID NO: 165.
  • the Fab comprises the VH of SEQ ID NO: 166 and the VL of SEQ ID NO: 167.
  • the Fab comprises the VH of SEQ ID NO: 168 and the VL of SEQ ID NO: 169.
  • the Fab comprises the VH of SEQ ID NO: 204 and the VL of SEQ ID NO: 205.
  • the Fab comprises the VH of SEQ ID NO: 75 and the VL of SEQ ID NO: 74.
  • the Fab comprises a VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163.
  • the Fab comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163.
  • the Fab comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163.
  • the Fab comprises a VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163.
  • the Fab comprises a VH which is at least 95% identical to the VH of SEQ ID NO: 162 and a VL which is at least 95% identical to the VL of SEQ ID NO: 163.
  • the Fab comprises a VH which is at least 99% identical to the VH of SEQ ID NO: 162 and a VL which is at least 95% identical to the VL of SEQ ID NO: 163.
  • the Fab comprises a VH which is at least 99% identical to the VH of SEQ ID NO: 162 and a VL which is at least 99% identical to the VL of SEQ ID NO: 163.
  • the Fab comprises a VH which is at least 99% identical to the VH of SEQ ID NO: 162 and a VL which is at least 95% identical to the VL of SEQ ID NO: 163.
  • the Fab comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 137 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 138.
  • the Fab comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 164 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 165.
  • the Fab comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 166 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 167.
  • the Fab comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 168 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 169.
  • the Fab comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 204 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 205.
  • the Fab comprises the VH of SEQ ID NOs: 4, 5, 6, 139, 159 or 161 and the VL of SEQ ID NOs: 1, 2, 3, 140 or 160, with the proviso that the Fab does not comprise the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 2.
  • the Fab comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 1.
  • the Fab comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 2.
  • the Fab comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 3.
  • the Fab comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 140.
  • the Fab comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 160.
  • the Fab comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 1.
  • the Fab comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 3.
  • the Fab comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 140.
  • the Fab comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 160.
  • the Fab comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 1.
  • the Fab comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 2.
  • the Fab comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 3.
  • the Fab comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 140.
  • the Fab comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 160.
  • the Fab comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 1.
  • the Fab comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 2.
  • the Fab comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 3.
  • the Fab comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 140.
  • the Fab comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 160.
  • the Fab comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 1.
  • the Fab comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 2.
  • the Fab comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 3.
  • the Fab comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 140.
  • the Fab comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 160.
  • the Fab comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 1.
  • the Fab comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 2.
  • the Fab comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 3.
  • the Fab comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 140.
  • the Fab comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 160.
  • the VH and VL of the Fab comprising the antigen binding domain that binds hK2 may be engineered into Fab-Fc HC (VH-CH1-hinge-CH2-CH3) and Fab-Fc LC (VL-CL) formats respectively.
  • the Fab-Fc HC comprises an amino acid sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 354.
  • the Fab-Fc HC comprises an amino acid sequence which is identical to SEQ ID NO: 354
  • the Fab-Fc HC comprises a C-terminal lysine residue (e.g. K477). In some embodiments, the Fab-Fc HC comprises an amino acid sequence having a C-terminal lysine residue and a sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 361. In a particular embodiment, the Fab-Fc HC comprises an amino acid sequence of SEQ ID NO:361.
  • the Fab-Fc LC comprises an amino acid sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 221. In a particular embodiment, the Fab-Fc LC comprises an amino acid sequence which is identical to SEQ ID NO: 221
  • a particularly suitable antigen binding domain that binds hK2 for incorporating into a multispecific construct comprises a Fab-Fc HC having the amino acid sequence of SEQ ID NO: 354 and a Fab-Fc LC having the amino acid sequence of SEQ ID NO: 221.
  • the F(ab′) 2 comprises
  • HCDR heavy chain complementarity determining region
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 141, 142, 143, 144, 145 and 146, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 176, 177, 178, 179, 180 and 181, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 183, 184, 185, 186, and 187, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 188, 189, 190, 191, 192, and 193, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 206, 207, 208, 182, 470, 209, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 147, 148, 143, 144, 145 and 146, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 194, 195, 172, 173, 174, and 175, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 196, 197, 178, 179, 180, 181, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 198, 199, 184, 185, 186, and 187, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 200, 201, 190, 191, 192, and 193, respectively.
  • the F(ab′) 2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 216, 217, 218, 182, 470, and 209, respectively.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 137 and the VL of SEQ ID NO: 138.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 164 and the VL of SEQ ID NO: 165.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 166 and the VL of SEQ ID NO: 167.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 168 and the VL of SEQ ID NO: 169.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 204 and the VL of SEQ ID NO: 205.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 75 and the VL of SEQ ID NO: 74.
  • the F(ab′) 2 comprises the VH of SEQ ID NOs: 4, 5, 6, 139, 159 or 161 and the VL of SEQ ID NOs: 1, 2, 3, 140 or 160, with the proviso that the Fab does not comprise the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 2.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 1.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 2.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 3.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 140.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 160.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 1.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 3.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 140.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 160.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 1.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 2.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 3.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 140.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 160.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 1.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 2.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 3.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 140.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 160.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 1.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 2.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 3.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 140.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 160.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 1.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 2.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 3.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 140.
  • the F(ab′) 2 comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 160.
  • the Fv comprises
  • HCDR heavy chain complementarity determining region
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 141, 142, 143, 144, 145 and 146, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 176, 177, 178, 179, 180 and 181, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 183, 184, 185, 186, and 187, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 188, 189, 190, 191, 192, and 193, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 206, 207, 208, 182, 470, 209, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 147, 148, 143, 144, 145 and 146, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 194, 195, 172, 173, 174, and 175, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 196, 197, 178, 179, 180, 181, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 198, 199, 184, 185, 186, and 187, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 200, 201, 190, 191, 192, and 193, respectively.
  • the Fv comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 216, 217, 218, 182, 470, and 209, respectively.
  • the Fv comprises the VH of SEQ ID NO: 137 and the VL of SEQ ID NO: 138.
  • the Fv comprises the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the Fv comprises the VH of SEQ ID NO: 164 and the VL of SEQ ID NO: 165.
  • the Fv comprises the VH of SEQ ID NO: 166 and the VL of SEQ ID NO: 167.
  • the Fv comprises the VH of SEQ ID NO: 168 and the VL of SEQ ID NO: 169.
  • the Fv comprises the VH of SEQ ID NO: 204 and the VL of SEQ ID NO: 205.
  • the Fv comprises the VH of SEQ ID NO: 75 and the VL of SEQ ID NO: 74.
  • the Fv comprises the VH of SEQ ID NOs: 4, 5 or 6 and the VL of SEQ ID NOs: 1, 2 or 3.
  • the Fv comprises the VH of SEQ ID NOs: 4, 5, 6, 139, 159 or 161 and the VL of SEQ ID NOs: 1, 2, 3, 140 or 160, with the proviso that the Fab does not comprise the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 2.
  • the Fv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 1.
  • the Fv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 2.
  • the Fv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 3.
  • the Fv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 140.
  • the Fv comprises the VH of SEQ ID NO: 4 and the VL of SEQ ID NO: 160.
  • the Fv comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 1.
  • the Fv comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 3.
  • the Fv comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 140.
  • the Fv comprises the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 160.
  • the Fv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 1.
  • the Fv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 2.
  • the Fv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 3.
  • the Fv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 140.
  • the Fv comprises the VH of SEQ ID NO: 6 and the VL of SEQ ID NO: 160.
  • the Fv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 1.
  • the Fv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 2.
  • the Fv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 3.
  • the Fv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 140.
  • the Fv comprises the VH of SEQ ID NO: 139 and the VL of SEQ ID NO: 160.
  • the Fv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 1.
  • the Fv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 2.
  • the Fv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 3.
  • the Fv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 140.
  • the Fv comprises the VH of SEQ ID NO: 159 and the VL of SEQ ID NO: 160.
  • the Fv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 1.
  • the Fv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 2.
  • the Fv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 3.
  • the Fv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 140.
  • the Fv comprises the VH of SEQ ID NO: 161 and the VL of SEQ ID NO: 160.
  • the Fd comprises the VH of SEQ ID NO: 75.
  • the Fd comprises the VH of SEQ ID NO: 4.
  • the Fd comprises the VH of SEQ ID NO: 5.
  • the Fd comprises the VH of SEQ ID NO: 6.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC of SEQ ID NO: 210 and a LC of SEQ ID NO: 221.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC of SEQ ID NO: 211 and a LC of SEQ ID NO: 222.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC of SEQ ID NO: 212 and a LC of SEQ ID NO: 223.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC of SEQ ID NO: 213 and a LC of SEQ ID NO: 224.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC of SEQ ID NO: 219 and a LC of SEQ ID NO: 220.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 354 and a LC which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 221.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 354 and a LC of SEQ ID NO: 221.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC of SEQ ID NO: 354 and a LC which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 221.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC which is at least 95% identical to SEQ ID NO: 354 and a LC which is at least 95% identical to SEQ ID NO: 221.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC which is at least 99% identical to SEQ ID NO: 354 and a LC which is at least 95% identical to SEQ ID NO: 221.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC which is at least 99% identical to SEQ ID NO: 354 and a LC which is at least 99% identical to SEQ ID NO: 221.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC which is at least 95% identical to SEQ ID NO: 354 and a LC which is at least 99% identical to SEQ ID NO: 221.
  • the isolated anti-hK2 antibody or the antigen binding fragment thereof comprises a HC of SEQ ID NO: 354 and a LC of SEQ ID NO: 221
  • variants may comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28 or 29 amino acid substitutions in the antigen binding domain that bind hK2 as long as they retain or have improved functional properties when compared to the parent antigen binding domains.
  • sequence identity may be about 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% to the antigen binding domains that bind hK2 of the disclosure.
  • the variation is in the framework regions.
  • variants are generated by conservative substitutions.
  • the antigen binding domains that bind hK2 may comprise substitutions at residue positions D16, A23, P41, G45, I49, M70, and A88, and V89 in the VH (residue numbering according to the hu11B6_VH of SEQ ID NO: 5) and D1, D9, S10, A12, V13, L15, I21, N22, K24, K49, R58, V62, D64, S80, L82, Q83, A84, V87, A88, Y91, Q104, and L108 in the VL (residue numbering according to the hu11B6_VL of SEQ ID NO: 2).
  • Conservative substitutions may be made at any indicated positions and the resulting variant antigen binding domains that bind hK2 are tested for their desired characteristics in the assays described herein.
  • an isolated protein comprising an antigen binding domain that binds hK2 comprises a VH and a VL which are at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH and VL, respectively, of an antigen binding domain that binds hK2 disclosed herein.
  • antigen binding domains that bind hK2 comprising the VH and the VL which are at least 80% identical to
  • the identity is 85%. In some embodiments, the identity is 90%. In some embodiments, the identity is 91%. In some embodiments, the identity is 91%. In some embodiments, the identity is 92%. In some embodiments, the identity is 93%. In some embodiments, the identity is 94%. In some embodiments, the identity is 94%. In some embodiments, the identity is 95%. In some embodiments, the identity is 96%. In some embodiments, the identity is 97%. In some embodiments, the identity is 98%. In some embodiments, the identity is 99%.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 137 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 138.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 164 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 165.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 166 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 167.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 166 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 444.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 168 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 169.
  • the antigen binding domains that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 204 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 205.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 85% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 90% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 91% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 92% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 93% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 94% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 95% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 96% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 97% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 98% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH which is at least 99% identical to the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 85% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 90% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 91% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 92% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 93% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 94% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 95% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 96% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 97% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 98% identical to the VL of SEQ ID NO: 163
  • the antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 99% identical to the VL of SEQ ID NO: 163
  • the percent identity between two amino acid sequences may be determined using the algorithm of E. Meyers and W. Miller ( Comput Appl Biosci 4:11-17 (1988)) which has been incorporated into the ALIGN program (version 2.0), using a PAM120 weight residue table, a gap length penalty of 12 and a gap penalty of 4.
  • the percent identity between two amino acid or nucleic acid sequences may be determined using the Needleman and Wunsch J Mol Biol 48:444453 (1970)) algorithm which has been incorporated into the GAP program in the GCG software package (available at http_//_www_gcg_com), using either a Blossum 62 matrix or a PAM250 matrix, and a gap weight of 16, 14, 12, 10, 8, 6, or 4 and a length weight of 1, 2, 3, 4, 5, or 6.
  • variant antigen binding domains that bind hK2 comprise one or two conservative substitutions in any of the CDR regions, while retaining desired functional properties of the parent antigen binding fragments that bind hK2.
  • Constant modifications refer to amino acid modifications that do not significantly affect or alter the binding characteristics of the antibody containing the amino acid modifications.
  • Conservative modifications include amino acid substitutions, additions and deletions.
  • Conservative amino acid substitutions are those in which the amino acid is replaced with an amino acid residue having a similar side chain.
  • amino acids with acidic side chains e.g., aspartic acid, glutamic acid
  • basic side chains e.g., lysine, arginine, histidine
  • nonpolar side chains e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine
  • uncharged polar side chains e.g., glycine, asparagine, glutamine, cysteine, serine, threonine, tyrosine, tryptophan
  • aromatic side chains e.g., phenylalanine, tryptophan, histidine, tyrosine
  • aliphatic side chains e.g., glycine, alanine, valine, leucine, isoleucine, serine, threonine
  • amide e.g., asparagine, glutamine
  • any native residue in the polypeptide may also be substituted with alanine, as has been previously described for alanine scanning mutagenesis (MacLennan et al., (1988) Acta Physiol Scand Suppl 643:55-67; Sasaki et al., (1988) Adv Biophys 35:1-24).
  • Amino acid substitutions to the antibodies of the invention may be made by known methods for example by PCR mutagenesis (U.S. Pat. No. 4,683,195).
  • libraries of variants may be generated for example using random (NNK) or non-random codons, for example DVK codons, which encode 11 amino acids (Ala, Cys, Asp, Glu, Gly, Lys, Asn, Arg, Ser, Tyr, Trp).
  • NNK random
  • DVK codons which encode 11 amino acids (Ala, Cys, Asp, Glu, Gly, Lys, Asn, Arg, Ser, Tyr, Trp).
  • the resulting variants may be tested for their characteristics using assays described herein.
  • Antigen binding domains that bind hK2 may be generated using various technologies.
  • the hybridoma method of Kohler and Milstein may be used to identify VH/VL pairs that bind hK2.
  • a mouse or other host animal such as a hamster, rat or chicken is immunized with human and/or cyno hK2, followed by fusion of spleen cells from immunized animals with myeloma cells using standard methods to form hybridoma cells.
  • Colonies arising from single immortalized hybridoma cells may be screened for production of the antibodies containing the antigen binding domains that bind hK2 with desired properties, such as specificity of binding, cross-reactivity or lack thereof, affinity for the antigen, and any desired functionality.
  • Antigen binding domains that bind hK2 generated by immunizing non-human animals may be humanized.
  • Exemplary humanization techniques including selection of human acceptor frameworks include CDR grafting (U.S. Pat. No. 5,225,539), SDR grafting (U.S. Pat. No. 6,818,749). Resurfacing (Padlan, (1991) Mol Immunol 28:489-499), Specificity Determining Residues Resurfacing (U.S. Patent Publ. No. 2010/0261620), human framework adaptation (U.S. Pat. No. 8,748,356) or superhumanization (U.S. Pat. No. 7,709,226). In these methods. CDRs or a subset of CDR residues of parental antibodies are transferred onto human frameworks that may be selected based on their overall homology to the parental frameworks, based on similarity in CDR length, or canonical structure identity, or a combination thereof.
  • Humanized antigen binding domains may be further optimized to improve their selectivity or affinity to a desired antigen by incorporating altered framework support residues to preserve binding affinity (backmutations) by techniques such as those described in Int. Patent Publ. Nos. WO1090/007861 and WO1992/22653, or by introducing variation at any of the CDRs for example to improve affinity of the antigen binding domain.
  • Transgenic animals such as mice, rat or chicken carrying human immunoglobulin (Ig) loci in their genome may be used to generate antigen binding fragments that bind hK2, and are described in for example U.S. Pat. No. 6,150,584, Int. Patent Pub. No. WO1999/45962, Int. Patent Pub. Nos. WO2002/066630, WO2002/43478, WO2002/043478 and WO1990/04036.
  • Ig immunoglobulin
  • the endogenous immunoglobulin loci in such animal may be disrupted or deleted, and at least one complete or partial human immunoglobulin locus may be inserted into the genome of the animal using homologous or non-homologous recombination, using transchromosomes, or using minigenes.
  • Companies such as Regeneron (http://_www_regeneron_com), Harbour Antibodies (http://_www_harbourantibodies_com), Open Monoclonal Technology, Inc.
  • Antigen binding domains that bind hK2 may be selected from a phage display library, where the phage is engineered to express human immunoglobulins or portions thereof such as Fabs, single chain antibodies (scFv), or unpaired or paired antibody variable regions.
  • the antigen binding domains that bind hK2 may be isolated for example from phage display library expressing antibody heavy and light chain variable regions as fusion proteins with bacteriophage pIX coat protein as described in Shi et al., (2010) J Mol Biol 397:385-96, and Int. Patent Publ. No. WO09/085462).
  • the libraries may be screened for phage binding to human and/or cyno hK2 and the obtained positive clones may be further characterized, the Fabs isolated from the clone lysates, and converted to scFvs or other configurations of antigen binding fragments.
  • immunogenic antigens and expression and production of antigen binding domains of the disclosure may be performed using any suitable technique, such as recombinant protein production.
  • the immunogenic antigens may be administered to an animal in the form of purified protein, or protein mixtures including whole cells or cell or tissue extracts, or the antigen may be formed de novo in the animal's body from nucleic acids encoding said antigen or a portion thereof.
  • the antigen binding domains that bind hK2 of the disclosure may be conjugated to a half-life extending moiety.
  • exemplary half-life extending moieties are albumin, albumin variants, albumin-binding proteins and/or domains, transferrin and fragments and analogues thereof, immunoglobulins (Ig) or fragments thereof, such as Fc regions.
  • Amino acid sequences of the aforementioned half-life extending moieties are known.
  • Ig or fragments thereof include all isotypes, i.e., IgG1, IgG2, IgG3, IgG4, IgM, IgA and IgE.
  • Additional half-life extending moieties that may be conjugated to the antigen binding domains that bind hK2 of the disclosure include polyethylene glycol (PEG) molecules, such as PEG5000 or PEG20,000, fatty acids and fatty acid esters of different chain lengths, for example laurate, myristate, stearate, arachidate, behenate, oleate, arachidonate, octanedioic acid, tetradecanedioic acid, octadecanedioic acid, docosanedioic acid, and the like, polylysine, octane, carbohydrates (dextran, cellulose, oligo- or polysaccharides) for desired properties.
  • PEG polyethylene glycol
  • moieties may be direct fusions with the antigen binding domains that bind hK2 of the disclosure and may be generated by standard cloning and expression techniques. Alternatively, well known chemical coupling methods may be used to attach the moieties to recombinantly produced antigen binding domains that bind hK2 of the disclosure.
  • a pegyl moiety may for example be conjugated to the antigen binding domain that bind hK2 of the disclosure by incorporating a cysteine residue to the C-terminus of the antigen binding domain that bind hK2 of the disclosure, or engineering cysteines into residue positions that face away from the hK2 binding site and attaching a pegyl group to the cysteine using well known methods.
  • the antigen binding fragment that binds hK2 is conjugated to a half-life extending moiety.
  • the half-life extending moiety is an immunoglobulin (Ig), a fragment of the Ig, an Ig constant region, a fragment of the Ig constant region, a Fc region, transferrin, albumin, an albumin binding domain or polyethylene glycol. In some embodiments, the half-life extending moiety is an Ig constant region.
  • Ig immunoglobulin
  • the half-life extending moiety is an Ig constant region.
  • the half-life extending moiety is the Ig.
  • the half-life extending moiety is the fragment of the Ig.
  • the half-life extending moiety is the Ig constant region.
  • the half-life extending moiety is the fragment of the Ig constant region.
  • the half-life extending moiety is the Fc region.
  • the half-life extending moiety is albumin.
  • the half-life extending moiety is the albumin binding domain.
  • the half-life extending moiety is transferrin.
  • the half-life extending moiety is polyethylene glycol.
  • the antigen binding domains that bind hK2 conjugated to a half-life extending moiety may be evaluated for their pharmacokinetic properties utilizing known in vivo models.
  • Ig Immunoglobulin
  • the antigen binding domains that bind hK2 of the disclosure may be conjugated to an Ig constant region or a fragment of the Ig constant region to impart antibody-like properties, including Fc effector functions C1q binding, complement dependent cytotoxicity (CDC), Fc receptor binding, antibody-dependent cell-mediated cytotoxicity (ADCC), phagocytosis or down regulation of cell surface receptors (e.g., B cell receptor; BCR).
  • the Ig constant region or the fragment of the Ig constant region functions also as a half-life extending moiety as discussed herein.
  • the antigen binding domains that bind hK2 of the disclosure may be engineered into conventional full-length antibodies using standard methods.
  • the full-length antibodies comprising the antigen binding domain that binds hK2 may further be engineered as described herein.
  • Immunoglobulin heavy chain constant region comprised of subdomains CH1, hinge, CH2 and CH3.
  • the CH1 domain spans residues A118-V215, the CH2 domain residues A231-K340 and the CH3 domain residues G341-K447 on the heavy chain, residue numbering according to the EU Index.
  • G341 is referred as a CH2 domain residue.
  • Hinge is generally defined as including E216 and terminating at P230 of human IgG1.
  • Ig Fc region comprises at least the CH2 and the CH3 domains of the Ig constant region, and therefore comprises at least a region from about A231 to K447 of Ig heavy chain constant region.
  • the invention also provides an antigen binding domain that binds hK2 conjugated to an immunoglobulin (Ig) constant region or a fragment of the Ig constant region.
  • Ig immunoglobulin
  • the Ig constant region is a heavy chain constant region
  • the Ig constant region is a light chain constant region.
  • the fragment of the Ig constant region comprises a Fc region.
  • the fragment of the Ig constant region comprises a CH2 domain.
  • the fragment of the Ig constant region comprises a CH3 domain.
  • the fragment of the Ig constant region comprises the CH2 domain and the CH3 domain.
  • the fragment of the Ig constant region comprises at least portion of a hinge, the CH2 domain and the CH3 domain.
  • Portion of the hinge refers to one or more amino acid residues of the Ig hinge.
  • the fragment of the Ig constant region comprises the hinge, the CH2 domain and the CH3 domain.
  • the antigen binding domain that binds hK2 is conjugated to the N-terminus of the Ig constant region or the fragment of the Ig constant region.
  • the antigen binding domain that binds hK2 is conjugated to the C-terminus of the Ig constant region or the fragment of the Ig constant region.
  • the antigen binding domain that binds hK2 is conjugated to the Ig constant region or the fragment of the Ig constant region via a second linker (L2).
  • the L2 comprises the amino acid sequence of SEQ ID NOs: 7, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, or 108.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 7.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 76.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 77.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 78.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 79.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 80.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 81.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 82.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 83.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 84.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 85.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 86.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 87.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 88.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 89.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 90.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 91.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 92.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 93.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 94.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 95.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 96.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 97.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 98.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 99.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 100.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 101.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 102.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 103.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 104.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 105.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 106.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 107.
  • the L2 comprises the amino acid sequence of SEQ ID NO: 108.
  • the antigen binding domains that binds hK2 of the disclosure conjugated to Ig constant region or the fragment of the Ig constant region may be assessed for their functionality using several known assays. Binding to hK2 may be assessed using methods described herein. Altered properties imparted by the Ig constant domain or the fragment of the Ig constant region such as Fc region may be assayed in Fc receptor binding assays using soluble forms of the receptors, such as the Fc ⁇ RI, Fc ⁇ RII, Fc ⁇ RIII or FcRn receptors, or using cell-based assays measuring for example ADCC, CDC or ADCP.
  • ADCC may be assessed using an in vitro assay using hK2 expressing cells as target cells and NK cells as effector cells. Cytolysis may be detected by the release of label (e.g. radioactive substrates, fluorescent dyes or natural intracellular proteins) from the lysed cells.
  • label e.g. radioactive substrates, fluorescent dyes or natural intracellular proteins
  • target cells are used with a ratio of 1 target cell to 4 effector cells.
  • Target cells are pre-labeled with BATDA and combined with effector cells and the test antibody. The samples are incubated for 2 hours and cell lysis measured by measuring released BATDA into the supernatant. Data is normalized to maximal cytotoxicity with 0.67% Triton X-100 (Sigma Aldrich) and minimal control determined by spontaneous release of BATDA from target cells in the absence of any antibody.
  • ADCP may be evaluated by using monocyte-derived macrophages as effector cells and any hK2 expressing cells as target cells which are engineered to express GFP or other labeled molecule.
  • effector:target cell ratio may be for example 4:1.
  • Effector cells may be incubated with target cells for 4 hours with or without the antibody of the invention. After incubation, cells may be detached using accutase.
  • Macrophages may be identified with anti-CD11b and anti-CD14 antibodies coupled to a fluorescent label, and percent phagocytosis may be determined based on % GFP fluorescence in the CD11 + CD14 + macrophages using standard methods.
  • CDC of cells may be measured for example by plating Daudi cells at 1 ⁇ 10 5 cells/well (50 ⁇ L/well) in RPMI-B (RPMI supplemented with 1% BSA), adding 50 ⁇ L of test protein to the wells at final concentration between 0-100 ⁇ g/mL, incubating the reaction for 15 min at room temperature, adding 11 ⁇ L of pooled human serum to the wells, and incubation the reaction for 45 min at 37° C. Percentage (%) lysed cells may be detected as % propidium iodide stained cells in FACS assay using standard methods.
  • the antigen binding domain that binds hK2 is conjugated to an IgG1 heavy chain constant region or a fragment of the IgG1 heavy chain constant region. In some embodiments, the antigen binding domain that binds hK2 is conjugated to an IgG1 heavy chain constant region or a fragment of the IgG1 heavy chain constant region (e.g. comprising the hinge-CH2-CH3) comprising an amino acid sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 110.
  • the IgG1 heavy chain constant region comprises the Fc silencing mutation (L234A_L235A_D265S) and the T350V_T366L_K392L_T394W mutations designed to promote selective heterodimerization.
  • the antigen binding domain that binds hK2 is conjugated to an IgG1 heavy chain constant region or a fragment of the IgG1 heavy chain constant region having the amino acid sequence of SEQ ID NO: 110.
  • the antigen binding domain that binds hK2 is conjugated to an IgG1 heavy chain constant region (e.g. CH1-hinge-CH2-CH3) comprising an amino acid sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the amino acid sequence of SEQ ID NO: 378.
  • the antigen binding domain that binds hK2 is conjugated to an IgG1 heavy chain constant region or a fragment of the IgG1 heavy chain constant region comprising the amino acid sequence of SEQ ID NO: 378.
  • the antigen binding domain that binds hK2 is conjugated to an IgG1 light chain constant region comprising an amino acid sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 309. In some embodiments, the antigen binding domain that binds hK2 is conjugated to an IgG1 light chain constant region comprising an amino acid sequence which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to SEQ ID NO: 447.
  • the antigen binding domain that binds hK2 is conjugated to an IgG1 light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309 or 447.
  • the antigen binding domain that binds hK2 is conjugated to an IgG1 light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309.
  • the isolated protein disclosed herein comprises an antigen binding domain that binds hK2 which is conjugated to an IgG1 heavy chain constant region comprising the amino acid sequence of SEQ ID NO: 378 and an antigen binding domain that binds hK2 which is conjugated to an IgG1 light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2 and a first Ig heavy chain constant region or fragment of a first Ig heavy chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 378.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2 and a first Ig light chain constant region or fragment of a first Ig light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2 and (i) a first Ig heavy chain constant region or fragment of a first Ig heavy chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 378; and (ii) a first Ig light chain constant region or fragment of a first Ig light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309.
  • the isolated protein disclosed herein comprises a second antigen binding domain that binds a lymphocyte antigen (e.g. CD3) and a second Ig constant region or a fragment of a second Ig constant region comprising an amino acid sequence which is identical to SEQ ID NO: 109.
  • a lymphocyte antigen e.g. CD3
  • a second Ig constant region or a fragment of a second Ig constant region comprising an amino acid sequence which is identical to SEQ ID NO: 109.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2 and (i) a first Ig heavy chain constant region or fragment of a first Ig heavy chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 378; and (ii) a first Ig light chain constant region or fragment of a first Ig light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309, and wherein the isolated protein further comprises a second antigen binding domain that binds a lymphocyte antigen (e.g. CD3) and a second Ig constant region or a fragment of a second Ig constant region comprising an amino acid sequence which is identical to SEQ ID NO: 109.
  • a lymphocyte antigen e.g. CD3
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2, wherein the first antigen binding domain that binds hK2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively, and a first Ig heavy chain constant region or fragment of a first Ig heavy chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 378.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2, wherein the first antigen binding domain that binds hK2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively, and a first Ig light chain constant region or fragment of a first Ig light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2, wherein the first antigen binding domain that binds hK2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively, and (i) a first Ig heavy chain constant region or fragment of a first Ig heavy chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 378; and (ii) a first Ig light chain constant region or fragment of a first Ig light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309.
  • the isolated protein disclosed herein comprises a second antigen binding domain that binds a lymphocyte antigen (e.g. CD3), wherein the second antigen binding domain that binds a lymphocyte antigen comprises the HCDR1 of SEQ ID NO: 255, the HCDR2 of SEQ ID NO: 256, the HCDR3 of SEQ ID NO: 257, the LCDR1 of SEQ ID NO: 258, the LCDR2 of SEQ ID NO: 259 and the LCDR3 of SEQ ID NO: 261, and a second Ig constant region or a fragment of a second Ig constant region comprising an amino acid sequence which is identical to SEQ ID NO: 109.
  • a lymphocyte antigen e.g. CD3
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2, wherein the first antigen binding domain that binds hK2 comprises the HCDR1, the HCDR1, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively, and (i) a first Ig heavy chain constant region or fragment of a first Ig heavy chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 378; and (ii) a first Ig light chain constant region or fragment of a first Ig light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309, and wherein the isolated protein further comprises a second antigen binding domain that binds a lymphocyte antigen (e.g.
  • a lymphocyte antigen e.g.
  • the second antigen binding domain that binds a lymphocyte antigen comprises the HCDR1 of SEQ ID NO: 255, the HCDR2 of SEQ ID NO: 256, the HCDR3 of SEQ ID NO: 257, the LCDR1 of SEQ ID NO: 258, the LCDR2 of SEQ ID NO: 259 and the LCDR3 of SEQ ID NO: 261, and a second Ig constant region or a fragment of a second Ig constant region comprising an amino acid sequence which is identical to SEQ ID NO: 109.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2, wherein the first antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163, and a first Ig heavy chain constant region or fragment of a first Ig heavy chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 378.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2, wherein the first antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163, and a first Ig light chain constant region or fragment of a first Ig light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2, wherein the first antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163, and (i) a first Ig heavy chain constant region or fragment of a first Ig heavy chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 378; and (ii) a first Ig light chain constant region or fragment of a first Ig light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309.
  • the isolated protein disclosed herein comprises a second antigen binding domain that binds a lymphocyte antigen (e.g. CD3), wherein the second antigen binding domain that binds a lymphocyte antigen comprises the amino acid sequence of SEQ ID NO: 331, and a second Ig constant region or a fragment of a second Ig constant region comprising an amino acid sequence which is identical to SEQ ID NO: 109.
  • a lymphocyte antigen e.g. CD3
  • the second antigen binding domain that binds a lymphocyte antigen comprises the amino acid sequence of SEQ ID NO: 331, and a second Ig constant region or a fragment of a second Ig constant region comprising an amino acid sequence which is identical to SEQ ID NO: 109.
  • the isolated protein disclosed herein comprises a first antigen binding domain that binds hK2, wherein the first antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163, and (i) a first Ig heavy chain constant region or fragment of a first Ig heavy chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 378; and (ii) a first Ig light chain constant region or fragment of a first Ig light chain constant region comprising an amino acid sequence which is identical to SEQ ID NO: 309, and wherein the isolated protein further comprises a second antigen binding domain that binds a lymphocyte antigen (e.g.
  • a lymphocyte antigen e.g.
  • the second antigen binding domain that binds a lymphocyte antigen comprises the amino acid sequence of SEQ ID NO: 331, and a second Ig constant region or a fragment of a second Ig constant region comprising an amino acid sequence which is identical to SEQ ID NO: 109.
  • antigen binding domains that bind hK2 of the disclosure may be engineered into monospecific or multispecific proteins of various designs using standard methods.
  • the disclosure also provides a monospecific protein comprising the antigen binding domain that binds hK2 of the disclosure.
  • the monospecific protein is an antibody.
  • the disclosure also provides a multispecific protein comprising the antigen binding domain that binds hK2 of the disclosure.
  • the multispecific protein is bispecific.
  • the multispecific protein is trispecific.
  • the multispecific protein is tetraspecific.
  • the multispecific protein is monovalent for binding to hK2.
  • the multispecific protein is bivalent for binding to hK2.
  • the disclosure also provides an isolated multispecific protein comprising a first antigen binding domain that binds hK2 and a second antigen binding domain that binds a lymphocyte antigen (such as CD3).
  • the lymphocyte antigen is a T cell antigen.
  • the T cell antigen is a CD8 + T cell antigen.
  • the lymphocyte antigen is a NK cell antigen.
  • the lymphocyte antigen is CD3, CD3 epsilon (CD3 ⁇ ), CD8, K12L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C.
  • the lymphocyte antigen is CD3 ⁇ .
  • the isolated multispecific protein is an anti-hK2/anti-CD3 protein.
  • the anti-hK2/anti-CD3 protein is bispecific.
  • the first antigen binding domain that binds hK2 and/or the second antigen binding domain that binds the lymphocyte antigen comprise a scFv, a (scFv) 2 , a Fv, a Fab, a F(ab′) 2 , a Fd, a dAb or a VHH.
  • the first antigen binding domain that binds hK2 and/or the second antigen binding domain that binds the lymphocyte antigen comprise the Fab.
  • the first antigen binding domain that binds hK2 comprises the Fab.
  • the second antigen binding domain that binds the lymphocyte antigen comprises the Fab.
  • the first antigen binding domain that binds hK2 and/or the second antigen binding domain that binds the lymphocyte antigen comprise the F(ab′) 2 .
  • the first antigen binding domain that binds hK2 comprises the F(ab′) 2 .
  • the second antigen binding domain that binds the lymphocyte antigen comprise the F(ab′) 2 .
  • the first antigen binding domain that binds hK2 and/or the second antigen binding domain that binds the lymphocyte antigen comprise the VHH.
  • the first antigen binding domain that binds hK2 comprises the VHH.
  • the second antigen binding domain that binds the lymphocyte antigen comprises the VHH.
  • the first antigen binding domain that binds hK2 and/or the second antigen binding domain that binds the lymphocyte antigen comprise the Fv.
  • the first antigen binding domain that binds hK2 comprises the Fv.
  • the second antigen binding domain that binds the lymphocyte antigen comprises the Fv.
  • the first antigen binding domain that binds hK2 and/or the second antigen binding domain that binds the lymphocyte antigen comprise the Fd.
  • the first antigen binding domain that binds hK2 comprises the Fd.
  • the second antigen binding domain that binds the lymphocyte antigen comprises the Fd.
  • the first antigen binding domain that binds hK2 and/or the second antigen binding domain that binds the lymphocyte antigen comprise the scFv.
  • the multispecific protein is bispecific, wherein the first antigen binding domain that binds hK2 comprises a Fab and the second antigen binding domain that binds the lymphocyte antigen (e.g. CD3) comprises a scFv.
  • the first antigen binding domain that binds comprises the scFv.
  • the second antigen binding domain that binds the lymphocyte antigen comprises the scFv.
  • the first antigen binding domain that binds hK2 comprises a scFv and the second antigen binding domain that binds the lymphocyte antigen comprises a Fab.
  • the first antigen binding domain that binds hK2 comprises a Fab and the second antigen binding domain that binds the lymphocyte antigen comprises a scFv.
  • the first antigen binding domain that binds hK2 comprises a scFv and the second antigen binding domain that binds the lymphocyte antigen comprises a Fab′.
  • the first antigen binding domain that binds hK2 comprises a Fab′ and the second antigen binding domain that binds the lymphocyte antigen comprises a scFv.
  • the first antigen binding domain that binds hK2 comprises a scFv and the second antigen binding domain that binds the lymphocyte antigen comprises a Fv.
  • the first antigen binding domain that binds hK2 comprises a dAb and the second antigen binding domain that binds the lymphocyte antigen comprises a scFv.
  • the first antigen binding domain that binds hK2 comprises a scFv and the second antigen binding domain that binds the lymphocyte antigen comprises a dAb.
  • the first antigen binding domain that binds hK2 comprises a Fd and the second antigen binding domain that binds the lymphocyte antigen comprises a scFv.
  • the first antigen binding domain that binds hK2 comprises a scFv and the second antigen binding domain that binds the lymphocyte antigen comprises a VHH.
  • the first antigen binding domain that binds hK2 comprises a VHH and the second antigen binding domain that binds the lymphocyte antigen comprises a scFv.
  • the first antigen binding domain that binds hK2 comprises a Fv and the second antigen binding domain that binds the lymphocyte antigen comprises a scFv.
  • the first antigen binding domain that binds hK2 comprises a scFv and the second antigen binding domain that binds the lymphocyte antigen comprises a Fd.
  • the scFv comprises, from the N- to C-terminus, a VH, a first linker (L1) and a VL (VH-L1-VL) or the VL, the L1 and the VH (VL-L1-VH).
  • the L comprises about 5-50 amino acids.
  • the L1 comprises about 5-40 amino acids.
  • the L1 comprises about 10-30 amino acids.
  • the L1 comprises about 10-20 amino acids.
  • the L1 comprises the amino acid sequence of SEQ ID NOs: 7, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, or 108.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 7.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 76.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 77.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 78.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 79.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 80.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 81.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 82.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 83.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 84.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 85.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 86.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 87.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 88.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 89.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 90.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 91.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 92.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 93.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 94.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 95.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 96.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 97.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 98.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 99.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 100.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 101.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 102.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 103.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 104.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 105.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 106.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 107.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 108.
  • the L1 comprises the amino acid sequence of SEQ ID NO: 7.
  • the first antigen binding domain that binds hK2 comprises the HCDR1 of SEQ ID NOs: 63, 72, 141, 147, 170, 176, 188, 194, 196, 198, 200, 206, or 216, the HCDR2 of SEQ ID NOs: 64, 65, 73, 142, 148, 171, 177, 188, 189, 195, 197, 199, 201, 207, or 217, the HCDR3 of SEQ ID NOs: 66, 143, 172, 178, 184, 190, 208, or 218, the LCDR1 of SEQ ID NOs: 67, 68, 144, 173, 179, 182, 185 or 191, the LCDR2 of SEQ ID NOs: 69, 70, 145, 174, 180, 186, 192, or 470 and the LCDR3 of SEQ ID NOs: 71, 146, 175, 181, 187, 193, or 209.
  • the first antigen binding domain that binds hK2 comprises the HCDR1, the HCDR2, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of
  • the first antigen binding domain that binds hK2 comprises the HCDR1, the HCDR2, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively or of SEQ ID NOs: 194, 195, 172, 173, 174, and 175, respectively.
  • the first antigen binding domain that binds hK2 comprises the HCDR1, the HCDR2, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 170, 171, 172, 173, 174 and 175, respectively, and the second antigen binding domain that binds a lymphocyte antigen, optionally which is CD3, CD3 epsilon (CD3F), CD8, K12L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • CD3F CD3 epsilon
  • CD8 K12L4 optionally which is CD3, CD3 epsilon (CD3F), CD8, K12L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • the first antigen binding domain that binds hK2 comprises the HCDR1, the HCDR2, the HCDR3, the LCDR1, the LCDR2 and the LCDR3 of SEQ ID NOs: 194, 195, 172, 173, 174, and 175, respectively, and the second antigen binding domain that binds a lymphocyte antigen, optionally which is CD3, CD3 epsilon (CD3 ⁇ ), CD8, K12L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • a lymphocyte antigen optionally which is CD3, CD3 epsilon (CD3 ⁇ ), CD8, K12L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 137 and the VL of SEQ ID NO: 138.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 164 and the VL of SEQ ID NO: 165.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 166 and the VL of SEQ ID NO: 167.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 168 and the VL of SEQ ID NO: 169.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 204 and the VL of SEQ ID NO: 205.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 75 and the VL of SEQ ID NO: 74.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 75 and the VL of SEQ ID NO: 74.
  • the first antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163.
  • the first antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163.
  • the first antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163.
  • the first antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g.
  • the second antigen binding domain that binds a lymphocyte antigen optionally which is CD3, CD3 epsilon (CD3 ⁇ ), CD8, K12L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • the first antigen binding domain that binds hK2 comprises a VH which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VH of SEQ ID NO: 162 and a VL of SEQ ID NO: 163, and the second antigen binding domain that binds a lymphocyte antigen, optionally which is CD3, CD3 epsilon (CD3 ⁇ ), CD8, K12L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • a lymphocyte antigen optionally which is CD3, CD3 epsilon (CD3 ⁇ ), CD8, K12L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • the first antigen binding domain that binds hK2 comprises a VH of SEQ ID NO: 162 and a VL which is at least 80% (e.g. at least 85%, at least 90%, at least 95% or at least 99%) identical to the VL of SEQ ID NO: 163, and the second antigen binding domain that binds a lymphocyte antigen, optionally which is CD3, CD3 epsilon (CD3 ⁇ ), CD8, K12L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NO: 162 and the VL of SEQ ID NO: 163, and the second antigen binding domain that binds a lymphocyte antigen, optionally which is CD3, CD3 epsilon (CD3 ⁇ ), CD8, KI2L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • a lymphocyte antigen optionally which is CD3, CD3 epsilon (CD3 ⁇ ), CD8, KI2L4, NKG2E, NKG2D, NKG2F, BTNL3, CD186, BTNL8, PD-1, CD195, or NKG2C, such as CD3.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NOs: 4, 5, 6, 139, 159 or 161 and the VL of SEQ ID NOs: 1, 2, 3, 140 or 160, with the proviso that the Fab does not comprise the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 2.
  • the first antigen binding domain that binds hK2 comprises the VH of SEQ ID NOs: 4, 5 or 6 and the VL of SEQ ID NOs: 1, 2 or 3, with the proviso that the first antigen binding domain that binds hK2 does not comprise the VH of SEQ ID NO: 5 and the VL of SEQ ID NO: 2.
  • the first antigen binding domain that binds hK2 comprises:
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NOs: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 133, 134, 135, 136, 308, 316, 318, 319, 320, 321, 322, 323, 324, 325, 404, 405, 406, 407, 408, or 409.
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 8.
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 9.
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 10.
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 11.
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 12.
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 13.
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 14.
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 15.
  • the first antigen binding domain that binds hK2 comprises the amino acid sequence of SEQ ID NO: 16.

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